tag:blogger.com,1999:blog-8304585649593202762024-03-13T13:07:58.538-03:00Ciências - 8º AnoCiências e Saúdehttp://www.blogger.com/profile/01659574780852675493noreply@blogger.comBlogger83125tag:blogger.com,1999:blog-830458564959320276.post-61485966285796007792020-06-20T00:01:00.000-03:002020-06-22T01:37:52.428-03:00Respiração <div class="separator" style="clear: both; text-align: center;">
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Fonte:</div>
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Super Interessante Coleções</div>
<div class="separator" style="clear: both; text-align: center;">
O Corpo Humano</div>
<div class="separator" style="clear: both; text-align: center;">
Respiração - Os Caminhos do Ar</div>
<div class="separator" style="clear: both; text-align: center;">
Volume 10 - 1998</div>
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Editora Abril</div>
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Ciências e Saúdehttp://www.blogger.com/profile/01659574780852675493noreply@blogger.com0tag:blogger.com,1999:blog-830458564959320276.post-15384425496456488562020-06-18T00:01:00.000-03:002020-06-18T23:38:27.639-03:00Diabete<div class="separator" style="clear: both; text-align: center;">
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Especial Saúde é Vital</div>
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Número 60</div>
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Editora Abril</div>
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Ciências e Saúdehttp://www.blogger.com/profile/01659574780852675493noreply@blogger.com2tag:blogger.com,1999:blog-830458564959320276.post-71054166303361322752020-03-28T00:01:00.000-03:002020-03-28T18:31:07.187-03:00Doenças transmitidas por Aedes Aegypti<div class="separator" style="clear: both; text-align: center;">
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<span style="font-size: large;">Caçador de Palavras</span></div>
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<span style="font-size: large;">Ano 19 - Edição 98</span></div>
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Ciências e Saúdehttp://www.blogger.com/profile/01659574780852675493noreply@blogger.com0tag:blogger.com,1999:blog-830458564959320276.post-25016465143171880332020-03-27T00:03:00.000-03:002020-03-27T15:54:02.049-03:00Obesidade Infantil<div class="separator" style="clear: both; text-align: center;">
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<span style="font-size: large;">Fonte:</span></div>
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<span style="font-size: large;">Caçador de Palavras</span></div>
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<span style="font-size: large;">Ano 19 - Edição 73</span></div>
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<span style="font-size: large;">Consulte Editora</span></div>
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Ciências e Saúdehttp://www.blogger.com/profile/01659574780852675493noreply@blogger.com0tag:blogger.com,1999:blog-830458564959320276.post-56104955424802842472020-03-27T00:02:00.000-03:002020-03-27T15:53:10.133-03:00A importância das vacinas<div class="separator" style="clear: both; text-align: center;">
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<span style="font-size: large;">Fonte:</span></div>
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<span style="font-size: large;">Caçador de Palavras</span></div>
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<span style="font-size: large;">Ano 19 - Edição 03</span></div>
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<span style="font-size: large;">Consulte Editora</span></div>
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Ciências e Saúdehttp://www.blogger.com/profile/01659574780852675493noreply@blogger.com0tag:blogger.com,1999:blog-830458564959320276.post-19095848476873341242020-03-27T00:01:00.000-03:002020-03-27T15:27:15.354-03:00Fontes de Energia<div class="separator" style="clear: both; text-align: center;">
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<span style="color: #6aa84f; font-size: large;">Fonte:</span></div>
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<span style="font-size: large;">Ache Palavras</span></div>
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<span style="font-size: large;">Edição 71</span></div>
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Ciências e Saúdehttp://www.blogger.com/profile/01659574780852675493noreply@blogger.com0tag:blogger.com,1999:blog-830458564959320276.post-82846083260298935782017-08-31T00:02:00.000-03:002019-09-27T09:15:36.830-03:00Experiência: Tinta Invisível <div style="text-align: justify;">
<span style="color: red; font-size: large;">Objetivo: </span></div>
<div style="text-align: justify;">
<span style="font-size: large;">Escrever num papel com tinta invisível e, a seguir, tornar a escrita visível usando uma reação química. </span></div>
<div style="text-align: justify;">
<span style="color: red; font-size: large;">Materiais: </span></div>
<div style="text-align: justify;">
<span style="font-size: large;">Suco de limão espremido na hora (lavar bem as mãos antes de se expor ao Sol); folha de papel branco; água; conta-gotas; colher; pincel fino; pincel grosso; dois copos de vidro (de requeijão); tintura de iodo (adquirida em farmácia). </span></div>
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<span style="color: yellow; font-size: large;">Cuidado, pois ela mancha a pele e as roupas! </span></div>
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<span style="color: red; font-size: large;">Procedimentos: </span></div>
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<span style="font-size: large;">a) Use o pincel fino para escrever com o suco de limão na folha de papel. </span></div>
<div style="text-align: justify;">
<span style="font-size: large;">b) Espere até que o papel seque à sombra. Não leve o papel ao Sol nem se exponha à luz solar antes de lavar bem as mãos para remover qualquer respingo de suco de limão. Tomar Sol com suco de limão na pele produz queimaduras e manchas escuras que levam muito tempo para sair. </span></div>
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<span style="font-size: large;">c) Adicione 30 gotas de tintura de iodo a 1/4 copo (de requeijão) de água e mexa com uma colher. </span></div>
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<span style="font-size: large;">d) Mergulhe o pincel grosso nesse líquido e esfregue-o sobre a folha. Observe os dizeres se tornarem visíveis. Proponha uma explicação para o que você observou. Compare sua explicação com a de outros grupos e discutam-na com o professor. </span></div>
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<span style="color: red; font-size: large;">Bibliografia: </span></div>
<div style="text-align: justify;">
<span style="font-size: large;">CANTO, Eduardo Leite do. Ciências Naturais: Aprendendo com o cotidiano. São Paulo: Editora Moderna, 2009.</span></div>
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Ciências e Saúdehttp://www.blogger.com/profile/01659574780852675493noreply@blogger.com0tag:blogger.com,1999:blog-830458564959320276.post-64704339702151214632017-08-31T00:01:00.000-03:002017-08-31T23:01:53.374-03:00Experiência: O balão mágico<div style="text-align: justify;">
<span style="color: red; font-size: large;">Materiais:</span></div>
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<span style="font-size: large;">Bexiga, </span><span style="font-size: large;">água, </span><span style="font-size: large;">vinagre, </span><span style="font-size: large;">1 garrafa pet (600 mL), </span><span style="font-size: large;">bicarbonato de sódio sólido e </span><span style="font-size: large;">colherinha.</span></div>
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<span style="font-size: large;"><span style="color: red;">Procedimento:</span> </span></div>
<div style="text-align: justify;">
<span style="font-size: large;">- Encha e esvazie a bexiga quatro vezes.</span></div>
<div style="text-align: justify;">
<span style="font-size: large;">- Coloque uma colherinha de bicarbonato dentro da bexiga.</span></div>
<div style="text-align: justify;">
<span style="font-size: large;">- Na garrafa pet, coloque dois dedos de água e dois dedos de vinagre.</span></div>
<div style="text-align: justify;">
<span style="font-size: large;">- Tampe a boca da garrafa com a bexiga (sem deixar o bicarbonato cair) e segure para que a bexiga não escape.</span></div>
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<span style="font-size: large;">- Levante a bexiga fazendo com que o bicarbonato caia dentro da garrafa.</span></div>
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<span style="font-size: large;">- Observe a bexiga enchendo.</span></div>
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<span style="font-size: large;"><span style="color: red;">Explicação:</span></span></div>
<div style="text-align: justify;">
<span style="font-size: large;">O bicarbonato entra em contato com o vinagre e libera gás carbônico. Como a tampa da garrafa está fechada, o gás vai para a bexiga, que se enche "sozinha".</span></div>
<div style="text-align: justify;">
<span style="font-size: large;"><span style="color: red;">Dica:</span></span></div>
<div style="text-align: justify;">
<span style="font-size: large;">Você poderá fazer este experimento usando um copo no lugar da garrafa e uma luva cirúrgica no lugar da bexiga.</span><br />
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Ciências e Saúdehttp://www.blogger.com/profile/01659574780852675493noreply@blogger.com0tag:blogger.com,1999:blog-830458564959320276.post-32870144160299151452017-03-13T00:01:00.000-03:002017-09-01T19:04:49.089-03:00Atlas de Anatomia (para colorir)<div class="separator" style="clear: both; text-align: center;">
<span style="color: red; font-size: large;">Sistema Digestório</span></div>
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<a href="https://1.bp.blogspot.com/-Xhh8EkhpAUo/WanYE5JDCJI/AAAAAAAAPjs/cQWNVuw8EHUUdxSafomnR3o4pxeAmb5TQCLcBGAs/s1600/1.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1600" data-original-width="1160" height="320" src="https://1.bp.blogspot.com/-Xhh8EkhpAUo/WanYE5JDCJI/AAAAAAAAPjs/cQWNVuw8EHUUdxSafomnR3o4pxeAmb5TQCLcBGAs/s320/1.jpg" width="232" /></a></div>
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<span style="font-size: large;"> <span style="color: red;">Cavidade oral e suas relações</span></span></div>
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<span style="color: red; font-size: large;">Anatomia de um dente</span></div>
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<span style="color: red; font-size: large;">Vias Urinárias</span></div>
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<span style="color: red; font-size: large;">Sistema Biliar e Pâncreas</span></div>
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<a href="https://3.bp.blogspot.com/-getUfAKui0A/WanYOOhi4sI/AAAAAAAAPj8/mC8yM4iDzowzQsVDwiWzssMfMx4eIiwEgCLcBGAs/s1600/5.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1600" data-original-width="1161" height="320" src="https://3.bp.blogspot.com/-getUfAKui0A/WanYOOhi4sI/AAAAAAAAPj8/mC8yM4iDzowzQsVDwiWzssMfMx4eIiwEgCLcBGAs/s320/5.jpg" width="232" /></a></div>
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Ciências e Saúdehttp://www.blogger.com/profile/01659574780852675493noreply@blogger.com2tag:blogger.com,1999:blog-830458564959320276.post-1440350644009741982013-11-28T00:01:00.000-02:002013-11-28T10:17:45.482-02:00Economizar no que for possível<div class="separator" style="clear: both; text-align: center;">
<a href="http://4.bp.blogspot.com/-uE-JA6sEcVY/Upcuujr430I/AAAAAAAAJZQ/8B94morAqQk/s1600/1l.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" src="http://4.bp.blogspot.com/-uE-JA6sEcVY/Upcuujr430I/AAAAAAAAJZQ/8B94morAqQk/s1600/1l.gif" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Quando
economizamos </span><i><span style="color: lime;">energia elétrica</span></i><span style="color: #b6d7a8;"> não estamos apenas poupando dinheiro. Estamos
também colaborando no uso racional dos recursos da natureza.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<a href="http://2.bp.blogspot.com/-wbuv_GsHN6Y/UpcwuTUWy4I/AAAAAAAAJZc/sZQCqeZ31G4/s1600/1.gif" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" src="http://2.bp.blogspot.com/-wbuv_GsHN6Y/UpcwuTUWy4I/AAAAAAAAJZc/sZQCqeZ31G4/s1600/1.gif" /></span></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Nos
locais em que existem usinas termelétricas, por exemplo, economia de energia
elétrica significa menos combustível queimado. Isso acarreta menos </span><i><span style="color: cyan;">poluição</span></i><span style="color: #b6d7a8;"> e,
ao mesmo tempo, poupa recursos não-renováveis, como petróleo e carvão mineral.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<a href="http://3.bp.blogspot.com/-z8SEYMqc_7s/Upcx2ZuFyoI/AAAAAAAAJZo/M4YoQsr6Dg8/s1600/1.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" src="http://3.bp.blogspot.com/-z8SEYMqc_7s/Upcx2ZuFyoI/AAAAAAAAJZo/M4YoQsr6Dg8/s1600/1.jpg" /></span></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">A
ideia é usar a energia de maneira inteligente. O que, em outras palavras, quer
dizer </span><i><span style="color: yellow;">economizar</span></i><span style="color: #b6d7a8;"> para que não tenhamos de construir tantas unidades industriais
de transformação de energia. Além disso, precisamos buscar alternativas que
provoquem menos danos ao meio ambiente.</span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">O
melhor a fazer é encontrar meios de usar mais eficientemente essas fontes. Veja
o que dá para fazer:</span></span><br />
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<a href="http://3.bp.blogspot.com/--3GjFNHvjhY/UpczuBj-53I/AAAAAAAAJZ8/2hgwBJA4ukc/s1600/1.gif" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" src="http://3.bp.blogspot.com/--3GjFNHvjhY/UpczuBj-53I/AAAAAAAAJZ8/2hgwBJA4ukc/s1600/1.gif" /></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Durante
o dia, aproveite a iluminação da luz solar e </span><i><span style="color: yellow;">desligue as lâmpadas</span></i><span style="color: #b6d7a8;"> </span></span><span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;">de sua casa. </span><br />
<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><br /></span></div>
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<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;">Desligue
da tomada aparelhos que não estão sendo usados. </span><br />
<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><br /></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;">Deixe sempre fechada a porta da
geladeira. </span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://2.bp.blogspot.com/-dFHsr-lc0N4/UpcyJR4D1KI/AAAAAAAAJZw/1954iYcF5JM/s1600/1.gif" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"></span></a></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<a href="http://2.bp.blogspot.com/-dFHsr-lc0N4/UpcyJR4D1KI/AAAAAAAAJZw/1954iYcF5JM/s1600/1.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" src="http://2.bp.blogspot.com/-dFHsr-lc0N4/UpcyJR4D1KI/AAAAAAAAJZw/1954iYcF5JM/s1600/1.gif" /></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Utilize </span><i><span style="color: cyan;">lâmpadas fluorescentes</span></i><span style="color: #b6d7a8;"> que são mais eficientes e desperdiçam
menos energia elétrica.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><i>Fonte:
Caderno do Professor: Ciências, Ensino Fundamental – 8º Ano, Volume 4.</i> São
Paulo: SEE, 2009.</span></span></div>
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Ciências e Saúdehttp://www.blogger.com/profile/01659574780852675493noreply@blogger.com0tag:blogger.com,1999:blog-830458564959320276.post-37417483788524080112013-11-20T00:01:00.000-02:002013-11-20T13:49:24.730-02:00Os transportes e os combustíveis<div class="separator" style="clear: both; text-align: center;">
<a href="http://3.bp.blogspot.com/-1pKxIstrnBU/UozLYC6c6fI/AAAAAAAAJVk/3OQ58EWB9Fc/s1600/1.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" src="http://3.bp.blogspot.com/-1pKxIstrnBU/UozLYC6c6fI/AAAAAAAAJVk/3OQ58EWB9Fc/s1600/1.gif" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Quando
se inventou a </span><i><span style="color: lime;">roda</span></i><span style="color: #b6d7a8;">, a ideia era facilitar o transporte de cargas grandes e
pesadas. O deslizar das rodas reduz o trabalho que o homem teria para
transportar essas cargas. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://4.bp.blogspot.com/-Y5EM2I4F85E/UozL7QtdiPI/AAAAAAAAJVs/ymbZY-uUwzk/s1600/1.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="150" src="http://4.bp.blogspot.com/-Y5EM2I4F85E/UozL7QtdiPI/AAAAAAAAJVs/ymbZY-uUwzk/s200/1.jpg" width="200" /></span></a></div>
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<span style="color: #b6d7a8;"><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;">A invenção da roda, de tão importante, ficou em
primeiro lugar no <i>ranking</i> </span><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;">das 100
maiores invenções da história.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<a href="http://1.bp.blogspot.com/-frxWTvSRtdQ/UozO3ftDLqI/AAAAAAAAJV4/t1LD628ip4U/s1600/1.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="200" src="http://1.bp.blogspot.com/-frxWTvSRtdQ/UozO3ftDLqI/AAAAAAAAJV4/t1LD628ip4U/s200/1.gif" width="190" /></span></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">O
combustível usado na época da invenção das rodas provinha do próprio trabalho
humano, cuja energia era gerada a partir do alimento que consumia (caça e/ou
vegetais). Ainda tentando facilitar a sua vida, o homem começa a usar animais
para puxar as cargas. O combustível era o trabalho realizado pelos animais
(burro, </span><i><span style="color: lime;">cavalo</span></i><span style="color: #b6d7a8;">, boi, cachorro), também com origem nos alimentos.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://3.bp.blogspot.com/-3e7c67217Tg/UozPYIy-p5I/AAAAAAAAJWA/ll_JybIWoZw/s1600/1.gif" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" src="http://3.bp.blogspot.com/-3e7c67217Tg/UozPYIy-p5I/AAAAAAAAJWA/ll_JybIWoZw/s1600/1.gif" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">A
evolução dos transportes é uma busca do homem por menor trabalho e maior
conforto.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://3.bp.blogspot.com/-pD-WPBrKXO4/UozQCYJ8HeI/AAAAAAAAJWI/fOyE_-KT1MM/s1600/1.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="178" src="http://3.bp.blogspot.com/-pD-WPBrKXO4/UozQCYJ8HeI/AAAAAAAAJWI/fOyE_-KT1MM/s200/1.jpg" width="200" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Há
sempre um gasto de energia na utilização de transportes: seja a queima de
alimentos, no trabalho humano ou animal, de combustíveis fósseis, como a
gasolina ou o diesel, ou de biomassa, como o </span><i><span style="color: lime;">álcool</span></i><span style="color: #b6d7a8;">.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Apesar
de estarmos usando o termo combustível, nem sempre a energia utilizada nos
transportes tem origem em uma combustão (queima). </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<a href="http://2.bp.blogspot.com/-Zn0f1Z7nBo8/UozRW1Skd4I/AAAAAAAAJWU/Oj2GSlsc-wE/s1600/1.jpeg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="120" src="http://2.bp.blogspot.com/-Zn0f1Z7nBo8/UozRW1Skd4I/AAAAAAAAJWU/Oj2GSlsc-wE/s200/1.jpeg" width="200" /></span></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Nos </span><i><span style="color: lime;">ônibus elétricos</span></i><span style="color: #b6d7a8;"> que
ainda circulam na cidade de São Paulo, a energia usada é elétrica. Há fios que
ligam o ônibus à fonte de energia elétrica. Esses fios são similares àqueles
que levam energia elétrica às nossas residências. Essa energia elétrica pode
vir de diferentes tipos de fontes.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://4.bp.blogspot.com/-odhzj6yYQXc/UozSNG4y0bI/AAAAAAAAJWg/C8090wP4Wts/s1600/1.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="97" src="http://4.bp.blogspot.com/-odhzj6yYQXc/UozSNG4y0bI/AAAAAAAAJWg/C8090wP4Wts/s200/1.jpg" width="200" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Se
pensarmos nos combustíveis mais utilizados hoje em veículos, temos: </span><i><span style="color: lime;">gasolina,
álcool, diesel e gás natural. </span></i></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://1.bp.blogspot.com/-FEVUmFGoSHI/UozTFr-fh8I/AAAAAAAAJWs/ttZN-wCS_VY/s1600/1.gif" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" src="http://1.bp.blogspot.com/-FEVUmFGoSHI/UozTFr-fh8I/AAAAAAAAJWs/ttZN-wCS_VY/s1600/1.gif" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">A </span><i><span style="color: lime;">gasolina</span></i><span style="color: #b6d7a8;"> e o diesel são derivados do petróleo e
são conhecidos como combustíveis fósseis, já que o petróleo é formado a partir
de uma lenta decomposição de plantas e animais. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; line-height: 115%;"><span style="color: #b6d7a8; font-size: large;"><br /></span></span></div>
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<a href="http://3.bp.blogspot.com/-zk2cDSIm5g0/UozT3kFtXwI/AAAAAAAAJW0/YigVdHSAhpw/s1600/1.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8; font-size: large;"><img border="0" height="150" src="http://3.bp.blogspot.com/-zk2cDSIm5g0/UozT3kFtXwI/AAAAAAAAJW0/YigVdHSAhpw/s200/1.jpg" width="200" /></span></a><span style="font-family: 'Times New Roman', serif; line-height: 115%;"><span style="font-size: large;"><span style="color: #b6d7a8;"></span></span></span></div>
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<span style="font-size: large;"><span style="color: #b6d7a8;"><span style="color: #b6d7a8; line-height: 115%;"><br /></span></span></span></div>
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<span style="font-size: large;"><span style="color: #b6d7a8;"><span style="color: #b6d7a8; line-height: 115%;"><br /></span></span></span></div>
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<span style="font-size: large;"><span style="color: #b6d7a8;"><span style="color: #b6d7a8; line-height: 115%;">Esses combustíveis também são
classificados como não-renováveis devido ao fato de sua renovação ocorrer numa
escala de tempo de milhões de anos. Ainda que os </span><i style="line-height: 115%;"><span style="color: lime;">combustíveis fósseis </span></i><span style="color: #b6d7a8; line-height: 115%;">continuem
sendo gerados a partir da decomposição de matéria orgânica, não são suficientes
para atender à enorme demanda mundial.</span></span></span></div>
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<div class="separator" style="clear: both; text-align: center;">
<a href="http://3.bp.blogspot.com/-wiG1KGu9S5U/UozUZuEwRUI/AAAAAAAAJW8/TsBYyKrYlOA/s1600/1.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="118" src="http://3.bp.blogspot.com/-wiG1KGu9S5U/UozUZuEwRUI/AAAAAAAAJW8/TsBYyKrYlOA/s200/1.jpg" width="200" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">O
</span><i><span style="color: lime;">gás natural</span></i><span style="color: #b6d7a8;">, assim como os derivados de petróleo, hoje em dia muito utilizado
em geração de energia elétrica nas termelétricas e em alguns meios de
transportes, também é um combustível fóssil e não-renovável. </span></span></div>
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<a href="http://3.bp.blogspot.com/-Htqkpuo5RPk/UozUsQW_8BI/AAAAAAAAJXE/BuKCGHZ5Dhc/s1600/1.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="141" src="http://3.bp.blogspot.com/-Htqkpuo5RPk/UozUsQW_8BI/AAAAAAAAJXE/BuKCGHZ5Dhc/s200/1.jpg" width="200" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Contudo, vem
ganhando importância no cenário mundial, principalmente por sua menor emissão
de gases que provocam o </span><i><span style="color: cyan;">efeito estufa</span></i><span style="color: #b6d7a8;">.</span></span></div>
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<a href="http://1.bp.blogspot.com/-NrFJvCqIcJU/UozV9fskTaI/AAAAAAAAJXQ/d7D-INr15Co/s1600/1.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="186" src="http://1.bp.blogspot.com/-NrFJvCqIcJU/UozV9fskTaI/AAAAAAAAJXQ/d7D-INr15Co/s200/1.jpg" width="200" /></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">O
álcool é um </span><i><span style="color: lime;">biocombustível</span></i><span style="color: #b6d7a8;">, já que sua produção vem da cana-de-açúcar, do
milho, do trigo ou da beterraba. No Brasil, o mais comum é o uso da
cana-de-açúcar para produzir o etanol, o álcool que utilizamos para abastecer
alguns automóveis. A Europa usa o trigo e a beterraba; já os EUA usam,
principalmente, o milho para a produção do álcool.</span></span></div>
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<a href="http://4.bp.blogspot.com/-7cwPKTKmPPw/UozWvFHqtQI/AAAAAAAAJXY/WidcX3E6p0Y/s1600/1.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="150" src="http://4.bp.blogspot.com/-7cwPKTKmPPw/UozWvFHqtQI/AAAAAAAAJXY/WidcX3E6p0Y/s200/1.jpg" width="200" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Assim
como no caso das usinas geradoras de eletricidade, cada um dos combustíveis
citados tem vantagens e desvantagens. No caso dos biocombustíveis, por exemplo,
uma crítica que se faz se deve à</span><i><span style="color: cyan;"> </span><span style="color: orange;">larga utilização de terras para plantações</span></i><span style="color: #b6d7a8;">,
fazendo com que a área de terras para a plantação de alimentos fique cada vez
menor.</span></span></div>
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<a href="http://2.bp.blogspot.com/-h7eOyGOe2fM/UozXbpbD9zI/AAAAAAAAJXg/pxzaxjOg1As/s1600/1.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="200" src="http://2.bp.blogspot.com/-h7eOyGOe2fM/UozXbpbD9zI/AAAAAAAAJXg/pxzaxjOg1As/s200/1.jpg" width="178" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Em
abril de 2008, Jean Ziegler, relator especial da ONU sobre o direito à
alimentação, afirmou que considera um crime contra a humanidade a produção em
massa dos biocombustíveis, por seu impacto nos </span><i><span style="color: lime;">preços dos alimentos</span></i><span style="color: #b6d7a8;">.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><i>Fonte:
Caderno do Professor: Ciências, Ensino Fundamental – 8º Ano, Volume 4. </i>São
Paulo: SEE, 2009.</span></span></div>
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Ciências e Saúdehttp://www.blogger.com/profile/01659574780852675493noreply@blogger.com0tag:blogger.com,1999:blog-830458564959320276.post-32404871930802123672013-11-14T00:01:00.000-02:002013-11-14T12:14:24.315-02:00Eficiência energética<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
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<a href="http://2.bp.blogspot.com/-qpRzpPb8ywI/UoTHTAx6mSI/AAAAAAAAJK8/SSGNTozAuLg/s1600/1g.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" src="http://2.bp.blogspot.com/-qpRzpPb8ywI/UoTHTAx6mSI/AAAAAAAAJK8/SSGNTozAuLg/s1600/1g.gif" /></span></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">É
surpreendente a quantidade de </span><i><span style="color: magenta;">perda de energia </span></i><span style="color: #b6d7a8;">no funcionamento de um carro.
Grande parte da energia fornecida ao veículo é dissipada (perdida). De toda a
energia fornecida ao veículo, apenas 12,5% dela é convertida em movimento das
rodas. Normalmente, os carros funcionam com um rendimento em torno de 20% a
25%.</span></span></div>
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<a href="http://4.bp.blogspot.com/-k65VC9DZ4t4/UoTHrXCVcsI/AAAAAAAAJLE/h5HItA0EUbw/s1600/2g.gif" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" src="http://4.bp.blogspot.com/-k65VC9DZ4t4/UoTHrXCVcsI/AAAAAAAAJLE/h5HItA0EUbw/s1600/2g.gif" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">As
perdas são tanto de origem mecânica quanto térmica. </span></span><br />
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span>
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">As perdas térmicas devem-se
à troca de calor do motor com o ambiente pelo sistema de refrigeração e à
energia interna dos </span><i><span style="color: lime;">gases de escape</span></i><span style="color: #b6d7a8;"> resultantes de explosão. </span></span></div>
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<a href="http://3.bp.blogspot.com/-QNdvbD5C51k/UoTKnmZpV-I/AAAAAAAAJLQ/5fMauZV_wnw/s1600/3g.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" src="http://3.bp.blogspot.com/-QNdvbD5C51k/UoTKnmZpV-I/AAAAAAAAJLQ/5fMauZV_wnw/s1600/3g.gif" /></span></a></div>
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">As perdas mecânicas
são consequências, basicamente, do atrito das superfícies metálicas e da
inércia do pistão.</span></span><br />
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span>
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Pistão é o elemento responsável por comprimir a mistura
combustível/ar na explosão e seu movimento é transmitido às rodas por meio do
</span><i><span style="color: lime;">virabrequim</span></i><span style="color: #b6d7a8;">. </span></span><br />
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<a href="http://4.bp.blogspot.com/-6RDD4PEhFD8/UoTK7C4rhpI/AAAAAAAAJLY/wTP59MNCML4/s1600/4g.gif" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="202" src="http://4.bp.blogspot.com/-6RDD4PEhFD8/UoTK7C4rhpI/AAAAAAAAJLY/wTP59MNCML4/s320/4g.gif" width="320" /></span></a></div>
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Outras perdas ocorrem: </span><i><span style="color: lime;">quanto mais acessórios</span></i><span style="color: #b6d7a8;"> (direção
hidráulica, ar condicionado, vidros e travas elétricas) o carro tiver, </span><i><span style="color: lime;">maior
será o consumo</span></i><span style="color: #b6d7a8;"> dos combustíveis para esses itens.</span></span><br />
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span>
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span>
<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><br /></span></div>
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<a href="http://1.bp.blogspot.com/-K_DKBjCs-fg/UoTOylGpWgI/AAAAAAAAJLk/FcdWjveW5gU/s1600/4.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="169" src="http://1.bp.blogspot.com/-K_DKBjCs-fg/UoTOylGpWgI/AAAAAAAAJLk/FcdWjveW5gU/s200/4.jpg" width="200" /></span></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Os
veículos com sistema de funcionamento elétrico possuem um rendimento maior do
que os térmicos, já que as perdas são bem menores. Nos </span><i><span style="color: lime;">motores elétricos</span></i><span style="color: #b6d7a8;">, elas
ocorrem principalmente pelo atrito interno entre as peças e pelo aquecimento
dos fios devido à corrente elétrica.</span></span><br />
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<a href="http://3.bp.blogspot.com/-OXkjHTHdWN4/UoTR1UBuYVI/AAAAAAAAJL4/pkSdzjbU33I/s1600/5.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="166" src="http://3.bp.blogspot.com/-OXkjHTHdWN4/UoTR1UBuYVI/AAAAAAAAJL4/pkSdzjbU33I/s200/5.jpg" width="200" /></span></a></div>
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Hoje,
com o avanço da tecnologia, temos carros conhecidos como </span><i><span style="color: cyan;">bicombustíveis</span></i><span style="color: #b6d7a8;">, que
podem ser abastecidos com gasolina ou álcool. </span></span><br />
<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><br /></span>
<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;">Embora ambos possam ser
utilizados nos carros com essa tecnologia, os dois combustíveis apresentam
características distintas. </span><br />
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://1.bp.blogspot.com/-K8VzNnJpk2o/UoTTG9WiL8I/AAAAAAAAJME/MShfRw6wOmc/s1600/6.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="139" src="http://1.bp.blogspot.com/-K8VzNnJpk2o/UoTTG9WiL8I/AAAAAAAAJME/MShfRw6wOmc/s200/6.jpg" width="200" /></span></a></div>
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Eles possuem </span><i><span style="color: yellow;">poder de combustão diferentes</span></i><span style="color: #b6d7a8;">. Se
usarmos duas lamparinas com a mesma quantidade de gasolina e de álcool
(etanol), a lamparina com gasolina ficaria acesa cerca de 30% a mais do que a
feita com álcool. </span></span><br />
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span>
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<a href="http://2.bp.blogspot.com/-VpOJpWgz4jg/UoTW0WgxkTI/AAAAAAAAJMQ/3I7rEBumSC8/s1600/6g.gif" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="200" src="http://2.bp.blogspot.com/-VpOJpWgz4jg/UoTW0WgxkTI/AAAAAAAAJMQ/3I7rEBumSC8/s200/6g.gif" width="150" /></span></a></div>
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">No carro, ocorre praticamente o mesmo: quando abastecido com
gasolina, o carro pode rodar por volta de 30% a mais do que quando abastecido
com a mesma quantidade de álcool. Assim, para valer a pena o uso do álcool, ele
precisa estar com um preço mais de 30% inferior ao da gasolina.</span></span><br />
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<a href="http://3.bp.blogspot.com/-t4S1obQj4y4/UoTXcNSQgqI/AAAAAAAAJMY/lNshi-WLCvQ/s1600/7g.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="112" src="http://3.bp.blogspot.com/-t4S1obQj4y4/UoTXcNSQgqI/AAAAAAAAJMY/lNshi-WLCvQ/s200/7g.gif" width="200" /></span></a><span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><i>Fonte:</i>
<i>Caderno do Professor: Ciências, Ensino Fundamental – 8º Ano, Volume 4.</i> São
Paulo: SEE, 2009.</span></div>
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Ciências e Saúdehttp://www.blogger.com/profile/01659574780852675493noreply@blogger.com0tag:blogger.com,1999:blog-830458564959320276.post-42823486991567406782013-11-07T00:01:00.000-02:002013-11-07T10:59:44.980-02:00A produção de cadernos e suas etapas<div class="separator" style="clear: both; text-align: center;">
<a href="http://2.bp.blogspot.com/-ZcZF5ZoeX64/UnuFCoRd8dI/AAAAAAAAJE4/YacwfRLZCyU/s1600/01.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="178" src="http://2.bp.blogspot.com/-ZcZF5ZoeX64/UnuFCoRd8dI/AAAAAAAAJE4/YacwfRLZCyU/s320/01.gif" width="320" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">As etapas
envolvidas no processo de fabricação e distribuição de um caderno são as seguintes:</span></span></div>
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<a href="http://4.bp.blogspot.com/-ktekrF4QSUU/UnuINrbFYMI/AAAAAAAAJFE/8xCIFURUQHw/s1600/01.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="140" src="http://4.bp.blogspot.com/-ktekrF4QSUU/UnuINrbFYMI/AAAAAAAAJFE/8xCIFURUQHw/s200/01.jpg" width="200" /></span></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">A
produção de papel se inicia atualmente com a plantação de árvores,
principalmente eucaliptos. </span></span></div>
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<a href="http://1.bp.blogspot.com/-y4QgB8I80xY/UnuJFPwxKBI/AAAAAAAAJFQ/7xsBk0dprhw/s1600/01.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="150" src="http://1.bp.blogspot.com/-y4QgB8I80xY/UnuJFPwxKBI/AAAAAAAAJFQ/7xsBk0dprhw/s200/01.jpg" width="200" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Após seu crescimento, derruba-se a árvore, pica-se a
madeira e inicia-se a produção da celulose e, em seguida, a do papel. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Mesmo
após a confecção do papel, ele ainda precisa ser encadernado para chegar até as
mãos dos alunos. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<a href="http://4.bp.blogspot.com/-28_lvEHivfk/UnuNDYHhhLI/AAAAAAAAJFc/VWALN09qZGY/s1600/01.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="140" src="http://4.bp.blogspot.com/-28_lvEHivfk/UnuNDYHhhLI/AAAAAAAAJFc/VWALN09qZGY/s200/01.jpg" width="200" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">O uso do caderno envolve aquilo que chamamos de consumo
indireto, já que todo o processo de confecção e distribuição do caderno
implicou gastos energéticos que ficaram embutidos no próprio caderno.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><i>Fonte:
Caderno do Professor: Ciências, Ensino Fundamental – 8º Ano, Volume 4.</i> São
Paulo: SEE, 2009.</span></span></div>
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Ciências e Saúdehttp://www.blogger.com/profile/01659574780852675493noreply@blogger.com0tag:blogger.com,1999:blog-830458564959320276.post-85568925451973759252013-10-31T00:01:00.000-02:002013-10-31T12:09:57.294-02:00O homem, sua história e o uso de energia<div class="separator" style="clear: both; text-align: center;">
<a href="http://1.bp.blogspot.com/-2-UDxUZjW6c/UnJWaGyUE9I/AAAAAAAAJAU/YjiY1z5lIWs/s1600/1.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="224" src="http://1.bp.blogspot.com/-2-UDxUZjW6c/UnJWaGyUE9I/AAAAAAAAJAU/YjiY1z5lIWs/s320/1.gif" width="320" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Os
estágios de desenvolvimento do homem, desde a </span><span style="color: lime;"><i>pré-história </i></span><span style="color: #b6d7a8;">até os dias atuais,
podem ser correlacionados com a energia por ele consumida, ilustrando o consumo
diário em alguns estágios do desenvolvimento humano.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<a href="http://1.bp.blogspot.com/-xJDL4gXH0U8/UnJWwL95XGI/AAAAAAAAJAc/WsnYcwYv3D8/s1600/1.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="200" src="http://1.bp.blogspot.com/-xJDL4gXH0U8/UnJWwL95XGI/AAAAAAAAJAc/WsnYcwYv3D8/s200/1.jpg" width="197" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Inicialmente,
o homem primitivo, há aproximadamente 1 milhão de anos, sem o </span><i><span style="color: yellow;">uso do fogo</span></i><span style="color: #b6d7a8;">,
tinha apenas a energia dos alimentos que ele consumia (2.000 kcal/dia). </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Num
segundo momento, o homem caçador, há aproximadamente 100 mil anos, tinha mais
comida e também queimava madeira para obter calor e para cozinhar.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://4.bp.blogspot.com/-4-H8rxjDdzc/UnJczQEs46I/AAAAAAAAJAs/PShAzxQ2fIQ/s1600/1.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="208" src="http://4.bp.blogspot.com/-4-H8rxjDdzc/UnJczQEs46I/AAAAAAAAJAs/PShAzxQ2fIQ/s320/1.jpg" width="320" /></span></a></div>
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<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;">Mais
tarde, o homem agrícola primitivo, por volta de 5.000 </span><st1:metricconverter productid="5.000 a" style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: x-large; line-height: 115%;" w:st="on">a</st1:metricconverter><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">.C., já utilizava a </span><span style="color: orange;"><i>energia
animal</i></span><span style="color: #b6d7a8;">. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Na fase avançada do homem agrícola, por volta de 1400 d.C., ele usava
carvão para aquecimento, a força da água e do vento e o transporte animal.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<a href="http://1.bp.blogspot.com/-p_m_T5PNRls/UnJeEusF3NI/AAAAAAAAJA4/zz7NJYUN8Jo/s1600/1.gif" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" src="http://1.bp.blogspot.com/-p_m_T5PNRls/UnJeEusF3NI/AAAAAAAAJA4/zz7NJYUN8Jo/s1600/1.gif" /></span></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Mais
recentemente, na sua fase industrial, o homem, por volta de 1.800, já utilizava
a </span><i><span style="color: red;">máquina a vapor</span></i><span style="color: #b6d7a8;">. Já o homem contemporâneo, tecnológico, consome por volta de
23.000 kcal/dia, cerca de 100 vezes mais que o homem primitivo. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://4.bp.blogspot.com/-0y72SDrukn0/UnJf9wnhsNI/AAAAAAAAJBE/5LmQlOWI7fw/s1600/1.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="240" src="http://4.bp.blogspot.com/-0y72SDrukn0/UnJf9wnhsNI/AAAAAAAAJBE/5LmQlOWI7fw/s320/1.gif" width="320" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Essa energia
claramente não está relacionada apenas à alimentação, mas também ao conforto,
como nos sistemas de aquecimento ou resfriamento de ambientes, ao uso de
equipamentos elétricos e eletrônicos, à iluminação, a </span><i><span style="color: #674ea7;">chuveiros elétricos</span></i><span style="color: #b6d7a8;"> etc.
Parte da energia consumida pelo homem é usada em transportes.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://2.bp.blogspot.com/-P5fF7fn04DE/UnJhEgqxMjI/AAAAAAAAJBU/sdhO-S8sIZI/s1600/1.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="160" src="http://2.bp.blogspot.com/-P5fF7fn04DE/UnJhEgqxMjI/AAAAAAAAJBU/sdhO-S8sIZI/s200/1.jpg" width="200" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">O
</span><i><span style="color: lime;">crescimento da energia</span></i><span style="color: #b6d7a8;"> consumida <i>per capita</i> </span></span><span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;">deve-se, principalmente, aos avanços da tecnologia, que aumentaram a
potência desenvolvida disponível para o homem.</span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<a href="http://3.bp.blogspot.com/-m2ThDn_qDtw/UnJgg5sN-xI/AAAAAAAAJBM/9ThBdyNI9xk/s1600/1.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="130" src="http://3.bp.blogspot.com/-m2ThDn_qDtw/UnJgg5sN-xI/AAAAAAAAJBM/9ThBdyNI9xk/s200/1.jpg" width="200" /></span></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Atualmente,
a </span><i><span style="color: cyan;">usina hidrelétrica de Itaipu</span></i><span style="color: #b6d7a8;">, usando 18 turbinas, é capaz de gerar cerca de
13.000.000 kW de potência.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://1.bp.blogspot.com/-9la3wozPPqY/UnJjQX8wOyI/AAAAAAAAJBg/jAWHY9g_Qlw/s1600/1.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="172" src="http://1.bp.blogspot.com/-9la3wozPPqY/UnJjQX8wOyI/AAAAAAAAJBg/jAWHY9g_Qlw/s320/1.jpg" width="320" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">É
importante ressaltar que o consumo de energia também se dá de forma indireta,
ou seja, não consumimos apenas o que é medido pelo relógio de luz ou pela bomba
de combustível, mas também tudo que é necessário para a produção e a
distribuição dos objetos que utilizamos, como caderno, lápis, cadeira, </span><i><span style="color: lime;">saco de
supermercado</span></i><span style="color: #b6d7a8;">, roupa etc.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><i>Fonte:
</i>Caderno do Professor: Ciências, Ensino Fundamental – 8º Ano, Volume 4. São
Paulo: SEE, 2009.</span></span></div>
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Ciências e Saúdehttp://www.blogger.com/profile/01659574780852675493noreply@blogger.com0tag:blogger.com,1999:blog-830458564959320276.post-52342620234967153612013-10-23T00:01:00.000-02:002013-10-23T00:01:00.577-02:00Transportes, combustíveis e eficiência<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<a href="http://3.bp.blogspot.com/-Knd5_Pq1R5s/UmACVffI3qI/AAAAAAAAI3U/CfqGJVirtU8/s1600/1.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8; font-size: large;"><img border="0" src="http://3.bp.blogspot.com/-Knd5_Pq1R5s/UmACVffI3qI/AAAAAAAAI3U/CfqGJVirtU8/s1600/1.gif" /></span></a></div>
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<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;">Em
cidades muito grandes, como São Paulo, com uma </span><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: cyan;"><i>frota tão grande de veículos</i></span></span><span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;">,
começamos a ter dúvidas em relação ao conforto que os transportes podem gerar, </span></div>
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<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><br /></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<a href="http://2.bp.blogspot.com/-8aEOaJZVUGQ/UmACo9uYhJI/AAAAAAAAI3c/4pHkasYIrVc/s1600/1.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" height="119" src="http://2.bp.blogspot.com/-8aEOaJZVUGQ/UmACo9uYhJI/AAAAAAAAI3c/4pHkasYIrVc/s200/1.jpg" width="200" /></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">já que o tempo gasto em deslocamento muitas vezes é bastante grande devido aos </span><i><span style="color: lime;">congestionamentos</span></i><span style="color: #b6d7a8;">.</span></span><span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"> </span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><br /></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<a href="http://3.bp.blogspot.com/-ra3yrq2DPKE/UmAExBSctZI/AAAAAAAAI34/0YJf4Hjc0O0/s1600/2.jpg" imageanchor="1" style="clear: left; display: inline !important; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="150" src="http://3.bp.blogspot.com/-ra3yrq2DPKE/UmAExBSctZI/AAAAAAAAI34/0YJf4Hjc0O0/s200/2.jpg" width="200" /></a><span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;">No entanto, se pensarmos no </span><span style="color: cyan; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><i>metrô</i></span><span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;">,</span><span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"> por exemplo, percebemos
com maior clareza as vantagens que a tecnologia pode trazer para nossos
deslocamentos.</span></div>
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<span style="font-family: 'Times New Roman', serif; line-height: 115%;"><span style="color: #b6d7a8; font-size: large;"><br /></span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<a href="http://3.bp.blogspot.com/-T_3T6zWvbNM/UmADZQAVD-I/AAAAAAAAI3o/tux0xTaYPF0/s1600/1.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="font-size: large;"><img border="0" height="138" src="http://3.bp.blogspot.com/-T_3T6zWvbNM/UmADZQAVD-I/AAAAAAAAI3o/tux0xTaYPF0/s200/1.jpg" width="200" /></span></a><a href="http://3.bp.blogspot.com/-T_3T6zWvbNM/UmADZQAVD-I/AAAAAAAAI3o/tux0xTaYPF0/s1600/1.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8; font-size: large;"></span></a><span style="font-size: large;"><span style="font-family: 'Times New Roman', serif; line-height: 115%;"><span style="color: #b6d7a8;"></span></span></span></div>
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<span style="font-size: large;"><span style="color: #b6d7a8;"><span style="font-family: 'Times New Roman', serif; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></span></span></div>
<span style="font-size: large;"><span style="color: #b6d7a8;">Novas
invenções, como carros bi e tricombustível e movidos à </span><i><span style="color: cyan;">célula solar</span></i><span style="color: #b6d7a8;"> ou a
hidrogênio, que vêm sendo concebidos em função não apenas do conforto, mas
seguindo uma política de sustentabilidade.</span><span style="color: #b6d7a8; font-family: 'Times New Roman', serif; line-height: 115%;"> </span></span><br />
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<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><br /></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<a href="http://2.bp.blogspot.com/-WwiFV0RwRMA/UmAD6Sro0WI/AAAAAAAAI3w/GZ4HfwJdC7I/s1600/1.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="146" src="http://2.bp.blogspot.com/-WwiFV0RwRMA/UmAD6Sro0WI/AAAAAAAAI3w/GZ4HfwJdC7I/s320/1.jpg" width="320" /></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Já que o combustível mais usado mundialmente, o petróleo, não é eterno
na nossa escala de tempo, é preciso pensar em alternativas a ele. Combustíveis
menos poluentes (</span><i><span style="color: cyan;">gás natural</span></i></span><span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;">) e de natureza renovável estão em alta devido às grandes
discussões </span></div>
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<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><br /></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">sobre o aumento na atmosfera terrestre de gases que provocam o </span><i><span style="color: yellow;">efeito
estufa</span></i><span style="color: #b6d7a8;">, que podem estar causando um aumento na temperatura média do planeta,
conhecido como aquecimento global.</span></span></div>
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<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><br /></span></div>
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<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><i>Fonte:</i>
Caderno do Professor: Ciências, Ensino Fundamental – 8º Ano, Volume 4. São
Paulo: SEE, 2009.</span></div>
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Ciências e Saúdehttp://www.blogger.com/profile/01659574780852675493noreply@blogger.com1tag:blogger.com,1999:blog-830458564959320276.post-29604813764358497902013-10-21T00:01:00.000-02:002013-10-21T00:01:00.238-02:00Impactos ambientais e desenvolvimento sustentável na produção de energia elétrica<div class="separator" style="clear: both; text-align: center;">
<a href="http://3.bp.blogspot.com/-BV_PeEcxH7o/Ul_5PhkwxvI/AAAAAAAAI2A/kOBdkZ1aphU/s1600/1.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="240" src="http://3.bp.blogspot.com/-BV_PeEcxH7o/Ul_5PhkwxvI/AAAAAAAAI2A/kOBdkZ1aphU/s320/1.jpg" width="320" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">É
preciso entender algumas características das diferentes usinas e as
consequências para o ambiente desde sua implantação até o seu funcionamento. A
seguir, veja os argumentos favoráveis e desfavoráveis para cada forma de
geração de eletricidade.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><i><span style="color: lime;">Hidrelétrica</span></i></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: cyan;"><i>Argumentos
favoráveis:</i></span><span style="color: #b6d7a8;"> Fonte renovável de energia; utiliza a água dos rios; não queima
combustível; não produz lixo; pode ser utilizada em sistemas de pequeno e
grande porte.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><i><span style="color: cyan;">Argumentos
desfavoráveis: </span></i><span style="color: #b6d7a8;">Mudança na fauna e na flora; deslocamento de populações
ribeirinhas; destruição de terras produtivas e florestas; desvio do curso dos
rios.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<a href="http://4.bp.blogspot.com/-sLe-2M8ipXs/Ul_62_xfkGI/AAAAAAAAI2Q/dL3wWR39VYo/s1600/1.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="203" src="http://4.bp.blogspot.com/-sLe-2M8ipXs/Ul_62_xfkGI/AAAAAAAAI2Q/dL3wWR39VYo/s320/1.jpg" width="320" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><i><span style="color: lime;">Termelétrica:</span></i><span style="color: #b6d7a8;">
combustíveis fósseis, biomassa e nuclear</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><i><span style="color: cyan;">Argumentos
favoráveis:</span></i><span style="color: #b6d7a8;"> Utiliza vários tipos de combustíveis; pode ser instalada em
qualquer local; seu funcionamento independe de fatores naturais, como Sol,
chuva ou vento; pode ser acionada a qualquer momento.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://3.bp.blogspot.com/-M53F1FvR-yw/Ul_7aZFhmmI/AAAAAAAAI2Y/1Ryf0O80V8I/s1600/1.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="211" src="http://3.bp.blogspot.com/-M53F1FvR-yw/Ul_7aZFhmmI/AAAAAAAAI2Y/1Ryf0O80V8I/s320/1.jpg" width="320" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><i><span style="color: cyan;">Argumentos
desfavoráveis:</span></i><span style="color: #b6d7a8;"> Poluição do ar por </span><i><span style="color: orange;">emissão de gases e cinzas</span></i><span style="color: #b6d7a8;"> devido à queima de
combustível (o que não ocorre no caso da termonuclear, mas, em contrapartida,
há a produção de lixo nuclear); aumento do efeito estufa devido à emissão de
gases; aumento da temperatura das águas dos rios que são utilizadas para o
sistema e para refrigeração; alto custo com manutenção.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<a href="http://2.bp.blogspot.com/-UnAWbBsBCa0/Ul_8SrQJNGI/AAAAAAAAI2g/5TQSGgh5yiw/s1600/2.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="190" src="http://2.bp.blogspot.com/-UnAWbBsBCa0/Ul_8SrQJNGI/AAAAAAAAI2g/5TQSGgh5yiw/s320/2.jpg" width="320" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><i><span style="color: lime;">Eólica</span></i></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><i><span style="color: lime;"><br /></span></i></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: cyan;"><i>Argumentos
favoráveis:</i></span><span style="color: #b6d7a8;"> Fonte renovável de energia; utiliza o vento; não queima
combustível; não produz lixo; pode ser utilizada em sistemas de pequeno e
grande porte.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<a href="http://2.bp.blogspot.com/-csFkgPPx5FM/Ul_8csynzEI/AAAAAAAAI2o/ZcVNOElgcmI/s1600/1.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="175" src="http://2.bp.blogspot.com/-csFkgPPx5FM/Ul_8csynzEI/AAAAAAAAI2o/ZcVNOElgcmI/s320/1.jpg" width="320" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><i><span style="color: cyan;"><br /></span></i></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><i><span style="color: cyan;">Argumentos
desfavoráveis: </span></i><span style="color: #b6d7a8;">Deve ser instalada em regiões com bastante vento; produz
poluição sonora; poluição visual; morte de pássaros que colidem com as pás do
gerador.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://1.bp.blogspot.com/-WF4WTjGmYeA/Ul_84fgek5I/AAAAAAAAI2w/dFLwHWXqKno/s1600/1.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="320" src="http://1.bp.blogspot.com/-WF4WTjGmYeA/Ul_84fgek5I/AAAAAAAAI2w/dFLwHWXqKno/s320/1.jpg" width="240" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: lime;"><i>Solar
fotovoltaica</i></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: lime;"><i><br /></i></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: cyan;"><i>Argumentos
favoráveis:</i></span><span style="color: #b6d7a8;"> Não queima combustível; precisa de pouca manutenção; tem vida útil
de 20 anos; pode ser usada em sistemas de pequeno e de grande porte; pode ser
transportada.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><i><span style="color: cyan;">Argumentos
desfavoráveis:</span></i><span style="color: #b6d7a8;"> Necessita de regiões com bastante Sol o ano inteiro; as células
utilizam materiais danosos ao ambiente em sua fabricação; as células não podem
ser recicladas; as baterias utilizadas precisam ser trocadas periodicamente.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://2.bp.blogspot.com/-hkW28qcuaPM/Ul_94zq4fvI/AAAAAAAAI24/wxi08wL42mo/s1600/1.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="320" src="http://2.bp.blogspot.com/-hkW28qcuaPM/Ul_94zq4fvI/AAAAAAAAI24/wxi08wL42mo/s320/1.jpg" width="296" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">A
</span><i><span style="color: lime;">energia renovável</span></i><span style="color: #b6d7a8;"> é obtida de fontes naturais capazes de se regenerar em um
curto período de tempo e a energia não-renovável é a energia obtida de recursos
que não são repostos pela natureza ou pela ação humana num curto período de
tempo.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">As
formas de gerar energia elétrica ao mesmo tempo que apresentam benefícios
também produzem </span><i><span style="color: lime;">impactos ambientais</span></i><span style="color: #b6d7a8;"> que precisam ser estudados e minimizados a
partir de um planejamento estratégico de implantação dessas usinas.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://3.bp.blogspot.com/-BNAftmtt1wg/Ul_-TMLjprI/AAAAAAAAI3A/94N2O7S5Ky0/s1600/1.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" src="http://3.bp.blogspot.com/-BNAftmtt1wg/Ul_-TMLjprI/AAAAAAAAI3A/94N2O7S5Ky0/s1600/1.gif" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Do
ponto de vista do desenvolvimento sustentável, embora haja usinas com menores
impactos ambientais, eles nunca são nulos. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">A construção de uma usina depende de
muitas </span><span style="color: lime;"><i>condições</i></span><span style="color: #b6d7a8;">: ambientais, econômicas, sociais e políticas. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">E todos esses
aspectos estão vinculados a uma determinada região ou país. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<a href="http://3.bp.blogspot.com/-8vvkDTZF8Xw/Ul_-nh1eQ2I/AAAAAAAAI3I/nBKsvdpfMNc/s1600/1.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="262" src="http://3.bp.blogspot.com/-8vvkDTZF8Xw/Ul_-nh1eQ2I/AAAAAAAAI3I/nBKsvdpfMNc/s320/1.jpg" width="320" /></span></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Há </span><i><span style="color: lime;">locais</span></i><span style="color: #b6d7a8;"> em que um
determinado tipo de usina é mais vantajoso do que outro, dependendo das
condições de geografia, geologia, clima, condições habitacionais, condições
econômicas.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><i>Fonte:</i>
Caderno do Professor: Ciências, Ensino Fundamental – 8º Ano, Volume 4. São
Paulo: SEE, 2009.</span></span></div>
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Ciências e Saúdehttp://www.blogger.com/profile/01659574780852675493noreply@blogger.com0tag:blogger.com,1999:blog-830458564959320276.post-74608248562391007252013-10-19T00:01:00.000-03:002013-10-19T00:01:00.056-03:00Diferentes tipos de energia<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<a href="http://3.bp.blogspot.com/-Xy5kjSPPRVo/Ul_0EJpuxlI/AAAAAAAAI1g/9MYQ9QHRF3w/s1600/1.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="240" src="http://3.bp.blogspot.com/-Xy5kjSPPRVo/Ul_0EJpuxlI/AAAAAAAAI1g/9MYQ9QHRF3w/s320/1.gif" width="320" /></span></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">A
energia mecânica está relacionada ao movimento (das águas, do ar) e a energia térmica,
ao calor. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Quando usamos uma </span><i><span style="color: cyan;">pilha</span></i><span style="color: #b6d7a8;">, estamos convertendo energia química em
energia elétrica. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<a href="http://2.bp.blogspot.com/-vWL3H7BBcI8/Ul_1f5VCSrI/AAAAAAAAI1s/A_NbbhgeWlo/s1600/1.gif" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="172" src="http://2.bp.blogspot.com/-vWL3H7BBcI8/Ul_1f5VCSrI/AAAAAAAAI1s/A_NbbhgeWlo/s320/1.gif" width="320" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">A </span><i><span style="color: lime;">célula solar</span></i><span style="color: #b6d7a8;"> presente em algumas </span><span style="color: cyan;"><i>calculadoras</i></span><span style="color: #b6d7a8;"> converte a energia
luminosa em energia elétrica. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Também é possível ressaltar a geração de
eletricidade a partir de células solares colocadas em casas. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://1.bp.blogspot.com/-y_bzNmGkgyQ/Ul_2OHL49YI/AAAAAAAAI10/ERvG92-6VMo/s1600/1.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="220" src="http://1.bp.blogspot.com/-y_bzNmGkgyQ/Ul_2OHL49YI/AAAAAAAAI10/ERvG92-6VMo/s320/1.jpg" width="320" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Essas células
aproveitam o potencial de algumas regiões onde a incidência de luz solar é alta
para gerar energia elétrica, que abastece casas e até pequenas comunidades.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><i>Fonte:</i>
Caderno do Professor: Ciências, Ensino Fundamental – 8º Ano, Volume 4. São
Paulo: SEE, 2009.</span></span></div>
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Ciências e Saúdehttp://www.blogger.com/profile/01659574780852675493noreply@blogger.com0tag:blogger.com,1999:blog-830458564959320276.post-48435112524764059542013-10-17T00:01:00.000-03:002013-10-17T11:17:15.117-03:00Formas de geração de eletricidade em cada tipo de usina<div class="separator" style="clear: both; text-align: center;">
<a href="http://4.bp.blogspot.com/-BOCK9E-GKGA/Ul_rSOcWUZI/AAAAAAAAI0E/quR7csIu_1c/s1600/1.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="149" src="http://4.bp.blogspot.com/-BOCK9E-GKGA/Ul_rSOcWUZI/AAAAAAAAI0E/quR7csIu_1c/s200/1.gif" width="200" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Na
maior parte das usinas, há turbinas que são movimentadas para acionar um
gerador. No caso da hidrelétrica, é a </span><i><span style="color: cyan;">queda-d´água</span></i><span style="color: #b6d7a8;"> a responsável por esse
movimento; nas termelétricas, o vapor de água; e na eólica, o vento. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<a href="http://4.bp.blogspot.com/-7rxA3vi9bdQ/Ul_r2Hi2wUI/AAAAAAAAI0M/8-SyVNHIcOM/s1600/1.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="153" src="http://4.bp.blogspot.com/-7rxA3vi9bdQ/Ul_r2Hi2wUI/AAAAAAAAI0M/8-SyVNHIcOM/s200/1.jpg" width="200" /></span></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">A usina
que não tem essa característica é a solar, que, por meio das </span><i><span style="color: #8e7cc3;">células
fotovoltaicas</span></i><span style="color: #b6d7a8;">, transforma diretamente a luz solar em energia elétrica.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<a href="http://1.bp.blogspot.com/-HG_Obw_wHQA/Ul_sgN84rbI/AAAAAAAAI0U/2qPbVM6uxFE/s1600/1.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="125" src="http://1.bp.blogspot.com/-HG_Obw_wHQA/Ul_sgN84rbI/AAAAAAAAI0U/2qPbVM6uxFE/s200/1.gif" width="200" /></span></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">O
movimento necessário para a produção de energia elétrica é feito pelas
</span><i><span style="color: cyan;">turbinas</span></i><span style="color: #b6d7a8;">, constituídas de pás que giram na passagem da água ou do vapor de
água. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://1.bp.blogspot.com/-xn7n23ZWiTQ/Ul_s2s6ZhiI/AAAAAAAAI0c/4JkVUtbPXqc/s1600/1.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="197" src="http://1.bp.blogspot.com/-xn7n23ZWiTQ/Ul_s2s6ZhiI/AAAAAAAAI0c/4JkVUtbPXqc/s200/1.jpg" width="200" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Esse movimento das turbinas é usado para movimentar um ímã ou uma bobina
e gerar a energia elétrica (</span><i><span style="color: lime;">gerador</span></i><span style="color: #b6d7a8;">). Nesses movimentos, há uma transformação
de energia.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<a href="http://3.bp.blogspot.com/-vu6zIcZ1Lx0/Ul_tZIO3ugI/AAAAAAAAI0o/G3A_51w5eMM/s1600/1.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="116" src="http://3.bp.blogspot.com/-vu6zIcZ1Lx0/Ul_tZIO3ugI/AAAAAAAAI0o/G3A_51w5eMM/s200/1.jpg" width="200" /></span></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Os
</span><i><span style="color: cyan;">transformadores</span></i><span style="color: #b6d7a8;"> têm a função de aumentar ou diminuir a voltagem, para minimizar
as perdas de energia no transporte da eletricidade.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://3.bp.blogspot.com/-53iAp0nSZdI/Ul_uuW30QUI/AAAAAAAAI00/BLWH2JiX2DY/s1600/1.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="150" src="http://3.bp.blogspot.com/-53iAp0nSZdI/Ul_uuW30QUI/AAAAAAAAI00/BLWH2JiX2DY/s200/1.jpg" width="200" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">A
eletricidade gerada em boa parte desses processos é depois transportada por
</span><i><span style="color: #e06666;">redes de transmissão de energia elétrica</span></i><span style="color: #b6d7a8;"> até as casas, indústrias e outros
centros de consumo e utilizada de várias formas, como para a iluminação e a
utilização dos mais diversos aparelhos elétricos domésticos ou industriais. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://2.bp.blogspot.com/-BIXVGrWH-cw/Ul_vNc6EFaI/AAAAAAAAI08/gnrnFcYE99Q/s1600/1.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="116" src="http://2.bp.blogspot.com/-BIXVGrWH-cw/Ul_vNc6EFaI/AAAAAAAAI08/gnrnFcYE99Q/s200/1.jpg" width="200" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">No
caso da energia solar, as </span><i><span style="color: #6fa8dc;">células fotovoltaicas</span></i><span style="color: #b6d7a8;"> normalmente são instaladas nas
próprias residências.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: lime;"><i>Visita
a uma usina</i></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<a href="http://1.bp.blogspot.com/-XXY-H2pz78M/Ul_vrfCy_ZI/AAAAAAAAI1E/MmQGLOIwiyg/s1600/1.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="142" src="http://1.bp.blogspot.com/-XXY-H2pz78M/Ul_vrfCy_ZI/AAAAAAAAI1E/MmQGLOIwiyg/s200/1.jpg" width="200" /></span></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">No
Estado de São Paulo, as usinas mais usadas são as termelétricas e as
hidrelétricas. É uma oportunidade para se conhecer os principais componentes de
uma usina e seu funcionamento. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://3.bp.blogspot.com/-TtHfRzy2duE/Ul_wAwC5WQI/AAAAAAAAI1M/eSZs90695Cw/s1600/1.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="133" src="http://3.bp.blogspot.com/-TtHfRzy2duE/Ul_wAwC5WQI/AAAAAAAAI1M/eSZs90695Cw/s200/1.jpg" width="200" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Nas </span><i><span style="color: cyan;">hidrelétricas</span></i><span style="color: #b6d7a8;">, é possível ver a barragem, as
turbinas, os geradores e as redes de transmissão. No caso das </span><i><span style="color: cyan;">termelétricas</span></i><span style="color: #b6d7a8;">, é
possível ver, além das caldeiras, as turbinas, os geradores e as redes de
transmissão.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><i>Fonte:</i>
Caderno do Professor: Ciências, Ensino Fundamental – 8º Ano, Volume 4. São
Paulo: SEE, 2009.</span></span></div>
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Ciências e Saúdehttp://www.blogger.com/profile/01659574780852675493noreply@blogger.com0tag:blogger.com,1999:blog-830458564959320276.post-24114072155238041272013-10-14T00:01:00.000-03:002013-10-17T10:38:04.314-03:00Fontes e produção de energia elétrica<div class="separator" style="clear: both; text-align: center;">
<a href="http://3.bp.blogspot.com/-8WcW8z3MNKc/UlbEDxtNmTI/AAAAAAAAIuQ/78PUHZl497U/s1600/2.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="196" src="http://3.bp.blogspot.com/-8WcW8z3MNKc/UlbEDxtNmTI/AAAAAAAAIuQ/78PUHZl497U/s200/2.gif" width="200" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">A
forma de energia mais usada nas casas, nas indústrias e no comércio é a
elétrica. Assim, estudar como obter </span><i><span style="color: yellow;">energia elétrica</span></i><span style="color: #b6d7a8;"> equivale a examinar todo o
problema energético. Hoje, temos várias formas de transformar diferentes fontes
de energia em eletricidade. Em seguida, listamos cinco formas de conversão de
energia em eletricidade.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://4.bp.blogspot.com/-Jor7dnVTraU/UlbEjSQBfyI/AAAAAAAAIuY/dFBuGmeBEJg/s1600/1.gif" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="148" src="http://4.bp.blogspot.com/-Jor7dnVTraU/UlbEjSQBfyI/AAAAAAAAIuY/dFBuGmeBEJg/s320/1.gif" width="320" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">A
</span><i><span style="color: lime;">geração hidrelétrica</span></i><span style="color: #b6d7a8;"> (geração de energia elétrica a partir do movimento das
águas) consiste, na maior parte das vezes, na construção de uma barragem em um
rio para represá-lo e, com isso, criar um reservatório de água. </span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Essa água será
usada para movimentar turbinas, que irão acionar um gerador que, por sua vez,
irá gerar a energia elétrica.</span></span></div>
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<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><br /></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://1.bp.blogspot.com/-ZvaMGIADgRc/UlbQggcps5I/AAAAAAAAIwE/XpOh3Franqc/s1600/1.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" src="http://1.bp.blogspot.com/-ZvaMGIADgRc/UlbQggcps5I/AAAAAAAAIwE/XpOh3Franqc/s1600/1.gif" /></a></div>
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<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;">A </span><span style="color: lime; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><i>geração termelétrica</i></span><span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"> </span><span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;">(geração de energia elétrica a partir do calor) segue
sempre um mesmo princípio: queimar um combustível para produzir calor, que gera
vapor para movimentar as turbinas, que acionam um gerador de energia elétrica.
Esse combustível pode ser um derivado de petróleo, carvão, madeira, gás natural
e bagaço de cana, entre outros. Mais comumente, são usados óleos combustíveis e
gás natural.</span></div>
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<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><br /></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<a href="http://1.bp.blogspot.com/-DlYSUwE6xsA/UlbHOirYHCI/AAAAAAAAIuw/j37dZ6Htj7U/s1600/1.gif" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" src="http://1.bp.blogspot.com/-DlYSUwE6xsA/UlbHOirYHCI/AAAAAAAAIuw/j37dZ6Htj7U/s1600/1.gif" /></a><span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;">A </span><span style="color: lime; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><i>geração eólica</i></span><span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"> </span><span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;">(geração de energia elétrica a partir do vento) ainda é um pouco
cara, mas, nas regiões onde os ventos são intensos ou constantes, pode ser uma
boa opção. </span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<a href="http://1.bp.blogspot.com/-mMb8gxbQXOQ/UlbIYGmU56I/AAAAAAAAIu8/LWtKBLux52w/s1600/1.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="200" src="http://1.bp.blogspot.com/-mMb8gxbQXOQ/UlbIYGmU56I/AAAAAAAAIu8/LWtKBLux52w/s200/1.jpg" width="195" /></a><a href="http://1.bp.blogspot.com/-mMb8gxbQXOQ/UlbIYGmU56I/AAAAAAAAIu8/LWtKBLux52w/s1600/1.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"></span></a><span style="font-family: 'Times New Roman', serif; line-height: 115%;"><span style="color: #b6d7a8; font-size: large;"></span></span></div>
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<span style="color: #b6d7a8; font-size: large;"><span style="line-height: 115%;"><br /></span></span></div>
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<span style="color: #b6d7a8; font-size: large;"><span style="line-height: 115%;">As modernas turbinas de vento são formadas por um conjunto de pás
ligadas a um eixo e a um gerador elétrico. </span></span></div>
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<span style="color: #b6d7a8; font-size: large;"><span style="line-height: 115%;"><br /></span></span></div>
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<span style="color: #b6d7a8; font-size: large;"><span style="line-height: 115%;">Com</span><span style="line-height: 115%;"> elas, a energia dos ventos é
convertida em energia elétrica.</span></span></div>
<br />
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<a href="http://1.bp.blogspot.com/-j-HSQTVtXek/UlbKx8pfqZI/AAAAAAAAIvY/w1pvfixF05o/s1600/1.gif" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" height="167" src="http://1.bp.blogspot.com/-j-HSQTVtXek/UlbKx8pfqZI/AAAAAAAAIvY/w1pvfixF05o/s320/1.gif" width="320" /></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">A </span><i><span style="color: lime;">geração termonuclear</span></i><span style="color: #b6d7a8;"> (geração de energia elétrica a partir do calor produzido
pela fissão nuclear) </span></span><span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;">gera calor pela fissão nuclear para gerar vapor,</span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<div class="separator" style="clear: both; text-align: center;">
<a href="http://3.bp.blogspot.com/-gri4qwBgBPs/UlbJB1jd12I/AAAAAAAAIvE/spvvUv-ylVM/s1600/1.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="174" src="http://3.bp.blogspot.com/-gri4qwBgBPs/UlbJB1jd12I/AAAAAAAAIvE/spvvUv-ylVM/s320/1.jpg" width="320" /></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">que
movimenta turbinas, que acionam um gerador de energia elétrica. Este tipo de
geração de energia elétrica também faz parte do grupo das usinas termelétricas.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://1.bp.blogspot.com/-ajr26MooAZc/UlbJoEzY9eI/AAAAAAAAIvM/q-qJeqrqf8o/s1600/1.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"></span></a></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://1.bp.blogspot.com/-ajr26MooAZc/UlbJoEzY9eI/AAAAAAAAIvM/q-qJeqrqf8o/s1600/1.gif" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" src="http://1.bp.blogspot.com/-ajr26MooAZc/UlbJoEzY9eI/AAAAAAAAIvM/q-qJeqrqf8o/s1600/1.gif" /></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">A
</span><i><span style="color: lime;">geração solar ou fotovoltaica </span></i><span style="color: #b6d7a8;">(geração de energia elétrica a partir da luz do
Sol) usa a célula solar que absorve a energia da luz para produzir energia
elétrica. Esse efeito é chamado de fotovoltaica, em que existe interação direta
da luz com a matéria: absorção da energia da luz (fótons) pelos elétrons dos
átomos (matéria).</span></span></div>
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<a href="http://3.bp.blogspot.com/-WsZ1pbGPT6Q/UlbMASC82aI/AAAAAAAAIvk/8rc_hibnADA/s1600/1.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="223" src="http://3.bp.blogspot.com/-WsZ1pbGPT6Q/UlbMASC82aI/AAAAAAAAIvk/8rc_hibnADA/s320/1.gif" width="320" /></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">É
importante ressaltar que a matéria-prima utilizada nas termelétricas é bem
diversificada. Enquanto nas usinas termonucleares (ou simplesmente nucleares) o
aquecimento da água é produzido pela </span><span style="color: red;"><i>fissão nuclear</i></span><span style="color: #b6d7a8;">, uma reação que ocorre no
núcleo atômico de um elemento radioativo (geralmente o urânio), </span></span></div>
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<div class="separator" style="clear: both; text-align: center;">
<a href="http://2.bp.blogspot.com/-gMfNZNRAYXQ/UlbN9lz2nNI/AAAAAAAAIvw/HbfvZ39jEsA/s1600/1.gif" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" height="137" src="http://2.bp.blogspot.com/-gMfNZNRAYXQ/UlbN9lz2nNI/AAAAAAAAIvw/HbfvZ39jEsA/s320/1.gif" width="320" /></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">nas demais
termelétricas (ditas convencionais) o calor é produzido pela queima de um
combustível (combustão), que pode ser o </span><i><span style="color: cyan;">gás natural</span></i><span style="color: #b6d7a8;">, o carvão mineral e o
diesel ou biomassa (derivados de organismos vegetais, como a lenha, o óleo
vegetal, o biodiesel e o etanol), para realizar o mesmo processo: obter energia
elétrica a partir da movimentação de turbinas pelo aquecimento (vaporização) da
água. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://2.bp.blogspot.com/-E1nRhxp1g0s/UlbPvdYVilI/AAAAAAAAIv8/zsPfy1N0WnA/s1600/1.gif" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"></span></a></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://4.bp.blogspot.com/-skVMIRWqf8Q/UlbQ3H96aSI/AAAAAAAAIwM/Dq6LsLqRxQ8/s1600/1.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" src="http://4.bp.blogspot.com/-skVMIRWqf8Q/UlbQ3H96aSI/AAAAAAAAIwM/Dq6LsLqRxQ8/s1600/1.gif" /></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Assim, as </span><span style="color: lime;"><i>termelétricas têm em comum</i></span><span style="color: #b6d7a8;"> o fato de todas, apesar de
utilizarem matérias-primas diferentes, aquecerem a água até a vaporização, e
este vapor é que move as turbinas.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><i>Fonte:</i>
Caderno do Professor: Ciências, Ensino Fundamental – 8º Ano, Volume 4. São
Paulo: SEE, 2009.</span></span></div>
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<br /></div>
Ciências e Saúdehttp://www.blogger.com/profile/01659574780852675493noreply@blogger.com2tag:blogger.com,1999:blog-830458564959320276.post-46466139350879095902013-10-12T00:01:00.000-03:002013-10-17T10:37:49.407-03:00Orientações sobre o uso seguro da eletricidade<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<div class="separator" style="clear: both; text-align: center;">
<a href="http://4.bp.blogspot.com/-Tga__bcMFbw/Ulaxn8Myc-I/AAAAAAAAIsg/vSzEWZQt8X8/s1600/1.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="191" src="http://4.bp.blogspot.com/-Tga__bcMFbw/Ulaxn8Myc-I/AAAAAAAAIsg/vSzEWZQt8X8/s200/1.jpg" width="200" /></span></a></div>
<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><br /></span></div>
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<span style="color: lime; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><i>Fios
e cabos partidos:</i></span></div>
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<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;">Não
toque nem se aproxime dos fios caídos e das pessoas ou objetos em contato com a
origem energizada.</span><br />
<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><br /></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<a href="http://1.bp.blogspot.com/-ZkONijqJRRQ/UlaxrzQf-DI/AAAAAAAAIso/6nRzMQZxQUw/s1600/2.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="137" src="http://1.bp.blogspot.com/-ZkONijqJRRQ/UlaxrzQf-DI/AAAAAAAAIso/6nRzMQZxQUw/s200/2.jpg" width="200" /></span></a><span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;">Não
tente ajudar a vítima sem estar preparado: o choque pode passar para você.</span></div>
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<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;">Se
um carro estiver em contato com fios, não se aproxime nem toque no carro ou no
fio.</span></div>
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<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><br /></span>
<br />
<div class="separator" style="clear: both; text-align: center;">
<a href="http://1.bp.blogspot.com/-QRXdM9rKWug/UlazWc9U-BI/AAAAAAAAItA/8BcIVe72KR4/s1600/1.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="200" src="http://1.bp.blogspot.com/-QRXdM9rKWug/UlazWc9U-BI/AAAAAAAAItA/8BcIVe72KR4/s200/1.jpg" width="195" /></span></a></div>
<span style="color: red; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><i>Cuidados
em casa no uso de equipamentos elétricos:</i></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Leia
com atenção o </span><i><span style="color: lime;">manual de instalação</span></i><span style="color: #b6d7a8;"> e siga as instruções do fabricante.</span></span></div>
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<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;">Desligue
sempre os equipamentos quando for limpar, guardar ou fazer pequenos reparos.</span></div>
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<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><br /></span>
<a href="http://3.bp.blogspot.com/-0ovTxqSSQn8/UlaydmoKxEI/AAAAAAAAIs0/gpvmG2iyhuA/s1600/2.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="148" src="http://3.bp.blogspot.com/-0ovTxqSSQn8/UlaydmoKxEI/AAAAAAAAIs0/gpvmG2iyhuA/s200/2.jpg" width="200" /></span></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><i><span style="color: magenta;">Não
puxe</span></i><span style="color: #b6d7a8;"> nem carregue os equipamentos pelos fios. Eles podem se danificar.</span></span></div>
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<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;">Não
sobrecarregue as tomadas com uso do benjamim. Você pode provocar uma
sobrecarga. Um fio ou tomada quente é uma indicação disso.</span><br />
<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><br /></span></div>
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<div class="separator" style="clear: both; text-align: center;">
<a href="http://4.bp.blogspot.com/-S0hIOafl2JM/Ula0xZUGP9I/AAAAAAAAItM/s9G78J1hlEs/s1600/1.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="148" src="http://4.bp.blogspot.com/-S0hIOafl2JM/Ula0xZUGP9I/AAAAAAAAItM/s9G78J1hlEs/s200/1.gif" width="200" /></span></a></div>
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Mantenha
qualquer </span><i><span style="color: #674ea7;">aparelho longe de pias, banheiras e superfícies molhadas ou úmidas</span></i><span style="color: #b6d7a8;">.
Mesmo desligados, podem provocar choques.</span></span></div>
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<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;">Se
um aparelho cair na água, desligue da tomada antes de recuperá-lo. A água é boa
condutora de energia elétrica.</span></div>
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<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;">Mantenha
cabos e fios fora das áreas de circulação de pessoas e livre de óleo e de água.</span><br />
<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><br /></span></div>
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<span style="color: red; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><i>Atenção
com as crianças:</i></span><br />
<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><br /></span></div>
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<div class="separator" style="clear: both; text-align: center;">
<a href="http://4.bp.blogspot.com/-llOUAbKB44I/Ula1ll29KTI/AAAAAAAAItY/7WY5Zz5OU_c/s1600/1.gif" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="140" src="http://4.bp.blogspot.com/-llOUAbKB44I/Ula1ll29KTI/AAAAAAAAItY/7WY5Zz5OU_c/s200/1.gif" width="200" /></span></a></div>
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Não
toque nem tente colocar </span><i><span style="color: cyan;">objetos pontiagudos </span></i><span style="color: #b6d7a8;">nas tomadas.</span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;">Subir
em árvores atravessadas por fios, seja por brincadeira ou para colher frutos,
pode ser perigoso, pois os galhos podem estar energizados.</span><br />
<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><br /></span></div>
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<div class="separator" style="clear: both; text-align: center;">
<a href="http://4.bp.blogspot.com/-c2H9K7F-UAU/Ula2PqyiAPI/AAAAAAAAItg/mpHfFFPh9rQ/s1600/1.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="148" src="http://4.bp.blogspot.com/-c2H9K7F-UAU/Ula2PqyiAPI/AAAAAAAAItg/mpHfFFPh9rQ/s200/1.jpg" width="200" /></span></a></div>
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><i><span style="color: #674ea7;">Empinar
pipas</span></i><span style="color: #b6d7a8;"> perto da rede elétrica, com linhas metalizadas, pode ser perigoso. A
linha pode conduzir a eletricidade.</span></span><br />
<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><br /></span></div>
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<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;">Não
tente recuperar pipas e outros objetos enroscados nos fios ou dentro das
subestações, pois você pode receber choque e até morrer. Brinque em locais
abertos e longe da rede elétrica.</span></div>
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<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><br /></span>
<br />
<div class="separator" style="clear: both; text-align: center;">
<a href="http://1.bp.blogspot.com/-NbwqI4M6fDA/Ula2zf71fCI/AAAAAAAAIto/JUxee8XjkP4/s1600/1.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="142" src="http://1.bp.blogspot.com/-NbwqI4M6fDA/Ula2zf71fCI/AAAAAAAAIto/JUxee8XjkP4/s200/1.jpg" width="200" /></span></a></div>
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Construir
as pipas com </span><i><span style="color: cyan;">material metalizado é perigoso</span></i><span style="color: #b6d7a8;">, pois pode conduzir a eletricidade
para a pipa. O uso do cerol também oferece riscos. Use sempre linha de algodão.</span></span><br />
<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><br /></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<a href="http://4.bp.blogspot.com/-rBLX1FjNoP8/Ula3dNOv_pI/AAAAAAAAItw/jYf67-Q02tk/s1600/1.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="149" src="http://4.bp.blogspot.com/-rBLX1FjNoP8/Ula3dNOv_pI/AAAAAAAAItw/jYf67-Q02tk/s200/1.jpg" width="200" /></span></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Não
brinque de consertar aparelhos elétricos, pois você pode </span><i><span style="color: orange;">tomar um choque</span></i><span style="color: #b6d7a8;">.</span></span><br />
<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><br /></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<a href="http://4.bp.blogspot.com/-7DbBc2Nne7g/Ula-6HH237I/AAAAAAAAIuA/9MccPe3-7YE/s1600/1.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="120" src="http://4.bp.blogspot.com/-7DbBc2Nne7g/Ula-6HH237I/AAAAAAAAIuA/9MccPe3-7YE/s200/1.jpg" width="200" /></span></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Nunca
entre em estações de energia </span><i><span style="color: lime;">nem suba em torres de transmissão</span></i><span style="color: #b6d7a8;">. Nesses locais,
existem equipamentos e cabos energizados. Mantenha distância.</span></span><br />
<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><br /></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><i>Fonte:</i>
Caderno do Professor: Ciências, Ensino Fundamental – 8º Ano, Volume 4. São
Paulo: SEE, 2009.</span></div>
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<br /></div>
Ciências e Saúdehttp://www.blogger.com/profile/01659574780852675493noreply@blogger.com0tag:blogger.com,1999:blog-830458564959320276.post-15119222023643627462013-10-10T00:01:00.000-03:002013-10-17T10:37:35.651-03:00A energia elétrica em nossa casa<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<a href="http://3.bp.blogspot.com/-CaTl-bo_bV4/UladFxH2o8I/AAAAAAAAIqg/aj33qGb_8Cc/s1600/2.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" src="http://3.bp.blogspot.com/-CaTl-bo_bV4/UladFxH2o8I/AAAAAAAAIqg/aj33qGb_8Cc/s1600/2.gif" /></span></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">A
</span><i><span style="color: lime;">tomada</span></i><span style="color: #b6d7a8;"> é uma espécie de “fonte” de energia elétrica da residência e que é nela
que ligamos os plugues dos aparelhos elétricos para que estes funcionem. </span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<a href="http://1.bp.blogspot.com/-muXdlPtr4GM/UlafofDTnAI/AAAAAAAAIq0/3YhKloctCa0/s1600/4.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="150" src="http://1.bp.blogspot.com/-muXdlPtr4GM/UlafofDTnAI/AAAAAAAAIq0/3YhKloctCa0/s200/4.jpg" width="200" /></span></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Assim
como as tomadas, as </span><i><span style="color: cyan;">pilhas e baterias</span></i><span style="color: #b6d7a8;"> são fontes de energia elétrica.</span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<a href="http://3.bp.blogspot.com/-sIfjjNTuP5w/Uladg_o6y_I/AAAAAAAAIqo/9ShJytE41f4/s1600/3.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" src="http://3.bp.blogspot.com/-sIfjjNTuP5w/Uladg_o6y_I/AAAAAAAAIqo/9ShJytE41f4/s1600/3.gif" /></span></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Por
que a lâmpada acende quando apertamos o </span><i><span style="color: lime;">interruptor de luz</span></i><span style="color: #b6d7a8;">? </span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Embora não vejamos
os fios de ligação e a fonte de energia elétrica, </span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://2.bp.blogspot.com/-4a3JeF2GcFk/Ulah8X0_IZI/AAAAAAAAIrA/kKtzJNGubHo/s1600/4.gif" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" src="http://2.bp.blogspot.com/-4a3JeF2GcFk/Ulah8X0_IZI/AAAAAAAAIrA/kKtzJNGubHo/s1600/4.gif" /></span></a></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">existe um circuito elétrico
interno às paredes que permite que a </span><i><span style="color: yellow;">lâmpada seja acesa</span></i><span style="color: #b6d7a8;"> e apagada. </span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Ao apertarmos
o interruptor, fechamos ou abrimos o circuito.</span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><i><span style="color: red;">Os
cuidados no uso da eletricidade</span></i></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<a href="http://4.bp.blogspot.com/-a72d3RpOViw/UlajmxMyEcI/AAAAAAAAIrM/1FR11rXHQKA/s1600/1.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="153" src="http://4.bp.blogspot.com/-a72d3RpOViw/UlajmxMyEcI/AAAAAAAAIrM/1FR11rXHQKA/s200/1.gif" width="200" /></span></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">O
que podemos fazer para evitar um </span><i><span style="color: yellow;">choque elétrico</span></i><span style="color: #b6d7a8;">?</span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<a href="http://1.bp.blogspot.com/-kagDNXOy7OI/UlakMuFm0RI/AAAAAAAAIrU/RqGa1rKjDIU/s1600/0.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="200" src="http://1.bp.blogspot.com/-kagDNXOy7OI/UlakMuFm0RI/AAAAAAAAIrU/RqGa1rKjDIU/s200/0.jpg" width="192" /></span></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Alguns
</span><i><span style="color: lime;">materiais</span></i><span style="color: #b6d7a8;"> são </span><span style="color: lime;"><i>isolantes</i></span><span style="color: #b6d7a8;"> como materiais de madeira, borracha e plástico e não
deixam a eletricidade circular (não fecham o circuito). </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<a href="http://1.bp.blogspot.com/-Xj_SBiEFQ_4/Ulak6x9L7wI/AAAAAAAAIrc/HJdNsx4xjQM/s1600/1.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" src="http://1.bp.blogspot.com/-Xj_SBiEFQ_4/Ulak6x9L7wI/AAAAAAAAIrc/HJdNsx4xjQM/s1600/1.gif" /></span></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"></span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="color: #b6d7a8;"><span style="font-family: 'Times New Roman', serif; line-height: 115%;"><span style="color: #b6d7a8; font-size: large;"><br /></span></span></span></div>
<span style="font-size: large;"><span style="color: #b6d7a8;"></span></span><br />
<div>
<span style="font-size: large;"><span style="color: #b6d7a8;"><span style="font-size: large;"><span style="color: #b6d7a8;"><br /></span></span></span></span></div>
<span style="font-size: large;"><span style="color: #b6d7a8;">
E outros são </span><i><span style="color: magenta;">condutores</span></i><span style="color: #b6d7a8;">,
os materiais feitos de metal, como a tesoura, a chave de fenda e o martelo, que
permitem a passagem de eletricidade pelo circuito (fecham o circuito).</span></span><br />
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://2.bp.blogspot.com/-RhNYnrDcoy4/UlalHmkhD4I/AAAAAAAAIrk/vNPBNAzjZ0U/s1600/2.gif" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" src="http://2.bp.blogspot.com/-RhNYnrDcoy4/UlalHmkhD4I/AAAAAAAAIrk/vNPBNAzjZ0U/s1600/2.gif" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Se
sentirmos choque, é porque nosso corpo deixa passar a eletricidade. </span></span><br />
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span>
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Dessa
forma, podemos receber e transmitir eletricidade. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Ao tocarmos um </span><i><span style="color: lime;">fio
desencapado</span></i><span style="color: #b6d7a8;"> ou uma tomada, a eletricidade que passa por ali, se conseguir
atravessar a nossa pele, seguirá pelo nosso corpo. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<a href="http://3.bp.blogspot.com/-Dh7c9_UaKqA/UlanJDXrIjI/AAAAAAAAIrw/x9l539PGPuQ/s1600/1.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"></span></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"></span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="color: #b6d7a8;"><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://2.bp.blogspot.com/-czPVzgvTPO4/UlawWs9XZxI/AAAAAAAAIsU/FghU9AapvTM/s1600/1.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="200" src="http://2.bp.blogspot.com/-czPVzgvTPO4/UlawWs9XZxI/AAAAAAAAIsU/FghU9AapvTM/s200/1.jpg" width="150" /></a></div>
<div style="text-align: justify;">
<span style="font-size: large;"><span style="color: #b6d7a8;">Se tivermos </span><i><span style="color: red;">descalços</span></i><span style="color: #b6d7a8;"> ou com
uma mão encostada em alguma superfície, iremos sentir choque porque a
eletricidade passará por nós, desde o fio ou a tomada até os pés ou a mão. </span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><br /></span>
<a href="http://3.bp.blogspot.com/-ACeY1Cj9mgA/Ulao6GAR_CI/AAAAAAAAIr8/MvFc4HKB1XA/s1600/1.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" height="133" src="http://3.bp.blogspot.com/-ACeY1Cj9mgA/Ulao6GAR_CI/AAAAAAAAIr8/MvFc4HKB1XA/s200/1.jpg" width="200" /></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Agora, se estivermos usando </span><i><span style="color: cyan;">sapatos com sola de borracha</span></i><span style="color: #b6d7a8;">, </span></span><span style="color: #b6d7a8; font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;">por exemplo, e não
estivermos em contato com outro material ou superfície, não levaremos choque
porque a borracha é um material isolante para voltagens como as residenciais
(110 V). </span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://4.bp.blogspot.com/-mP7nrixeEwg/UlapNEOlWzI/AAAAAAAAIsE/l2kir9EOYJw/s1600/1.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="150" src="http://4.bp.blogspot.com/-mP7nrixeEwg/UlapNEOlWzI/AAAAAAAAIsE/l2kir9EOYJw/s200/1.jpg" width="200" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Em situações de </span><i><span style="color: cyan;">alta tensão</span></i><span style="color: #b6d7a8;">, muitas vezes a borracha deixa de ser
isolante.</span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><i>Fonte:
</i>Caderno do Professor: Ciências, Ensino Fundamental – 8º Ano, Volume 4. São
Paulo: SEE, 2009.</span></span></div>
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Ciências e Saúdehttp://www.blogger.com/profile/01659574780852675493noreply@blogger.com0tag:blogger.com,1999:blog-830458564959320276.post-15702528290137852982013-10-05T00:01:00.000-03:002013-10-17T10:37:17.864-03:00A eletricidade no dia a dia<div class="separator" style="clear: both; text-align: center;">
<a href="http://2.bp.blogspot.com/-xsYbibOQMvA/Uk2ZV1HEeNI/AAAAAAAAIl0/95mBI3GWrGw/s1600/1.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" src="http://2.bp.blogspot.com/-xsYbibOQMvA/Uk2ZV1HEeNI/AAAAAAAAIl0/95mBI3GWrGw/s1600/1.gif" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Nossa
sociedade é bastante dependente de </span><i><span style="color: yellow;">energia elétrica</span></i><span style="color: #b6d7a8;">. No seu dia a dia, que tipo
de atividade depende da energia elétrica para ser realizada? Como seria o seu
dia sem eletricidade? Quais os equipamentos que necessitam de energia elétrica
para funcionar? </span></span></div>
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<a href="http://4.bp.blogspot.com/-Jce8a55aAN0/Uk2Z2IMB8tI/AAAAAAAAIl8/4XLzhK7UsRI/s1600/1.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="135" src="http://4.bp.blogspot.com/-Jce8a55aAN0/Uk2Z2IMB8tI/AAAAAAAAIl8/4XLzhK7UsRI/s200/1.jpg" width="200" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Embora
haja uma variedade de aparelhos que utilizem energia elétrica para funcionar,
eles apresentam funções diferentes. As funções desses aparelhos, seus usos e
suas características, atentam para semelhanças e diferenças.</span></span></div>
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<a href="http://2.bp.blogspot.com/-J-XXaKjl0xk/Uk2bCE-nwvI/AAAAAAAAImI/ZPp6fM4fosQ/s1600/1.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="136" src="http://2.bp.blogspot.com/-J-XXaKjl0xk/Uk2bCE-nwvI/AAAAAAAAImI/ZPp6fM4fosQ/s200/1.jpg" width="200" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">O
consumo de energia elétrica depende de uma característica dos diferentes
aparelhos elétricos chamada potência. A </span><i><span style="color: lime;">potência</span></i><span style="color: #b6d7a8;"> dos aparelhos é expressa em
<i>watts (W)</i> e quase todos os aparelhos trazem essa informação impressa em suas
embalagens, em chapinhas ou etiquetas de fabricação neles afixadas, ou nos
manuais de instrução.</span></span></div>
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<a href="http://2.bp.blogspot.com/-qKSjJEsmLDE/Uk2b28FTFCI/AAAAAAAAImU/EAu2eLVMTIk/s1600/1.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" height="156" src="http://2.bp.blogspot.com/-qKSjJEsmLDE/Uk2b28FTFCI/AAAAAAAAImU/EAu2eLVMTIk/s200/1.jpg" width="200" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Existem
outras grandezas como </span><i><span style="color: cyan;">voltagem (V)</span><span style="color: #b6d7a8;">, corrente elétrica ou amperagem (A), frequência</span></i><span style="color: #b6d7a8;">
que também representam características desses aparelhos.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Para
calcular o consumo de energia, é importante a leitura atenta dos manuais de
instrução para o uso correto e seguro dos aparelhos elétricos.</span></span></div>
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<a href="http://2.bp.blogspot.com/-9JJzbti1GWU/Uk2c0ao5AQI/AAAAAAAAImg/t1u68ypK1WU/s1600/1.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="200" src="http://2.bp.blogspot.com/-9JJzbti1GWU/Uk2c0ao5AQI/AAAAAAAAImg/t1u68ypK1WU/s200/1.jpg" width="150" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">O
</span><i><span style="color: orange;">relógio de luz</span></i><span style="color: #b6d7a8;"> é um aparelho que registra o consumo de energia elétrica. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Geralmente, ele fica do lado de fora das residências para que o funcionário da
companhia elétrica possa fazer a leitura e anotar o resultado. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">O relógio de luz
registra a soma do consumo de todos os aparelhos elétricos da casa, incluindo
as lâmpadas. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">O funcionário anota a posição de cada um dos ponteiros. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Para
determinar o consumo mensal da residência, o funcionário calcula a diferença
entre o valor dessa leitura e aquele encontrado na leitura realizada no mês
anterior.</span></span></div>
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<a href="http://4.bp.blogspot.com/-2jhiNk1eNww/Uk2t3XkJ2PI/AAAAAAAAInE/Wf5Ea8v1Tc0/s1600/1.png" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="168" src="http://4.bp.blogspot.com/-2jhiNk1eNww/Uk2t3XkJ2PI/AAAAAAAAInE/Wf5Ea8v1Tc0/s200/1.png" width="200" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Há
uma relação entre a potência dos aparelhos e a rapidez de giro do disco do
relógio de luz. De modo geral, os aparelhos com a função de </span><i><span style="color: lime;">aquecimento</span></i><span style="color: #b6d7a8;">
consomem mais energia. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<a href="http://4.bp.blogspot.com/-LWE7zO7njLo/Uk2uazJKkiI/AAAAAAAAInM/c9bjCFMXBPI/s1600/1.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #b6d7a8;"><img border="0" src="http://4.bp.blogspot.com/-LWE7zO7njLo/Uk2uazJKkiI/AAAAAAAAInM/c9bjCFMXBPI/s1600/1.gif" /></span></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Os que são utilizados para </span><i><span style="color: #8e7cc3;">movimentar</span></i><span style="color: #b6d7a8;"> consomem menos que
os anteriores. </span></span></div>
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<a href="http://2.bp.blogspot.com/-35llYaYrBiI/Uk2vPvzVxLI/AAAAAAAAInY/iXk7I41E5Kg/s1600/1.gif" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #b6d7a8;"><img border="0" height="143" src="http://2.bp.blogspot.com/-35llYaYrBiI/Uk2vPvzVxLI/AAAAAAAAInY/iXk7I41E5Kg/s200/1.gif" width="200" /></span></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">E os </span><i><span style="color: cyan;">comunicadores</span></i><span style="color: #b6d7a8;"> são os que consomem menos energia.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;">Outros
fatores que interferem no consumo é o </span><i><span style="color: lime;">tempo de uso</span></i><span style="color: #b6d7a8;"> desses aparelhos.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><br /></span></span></div>
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<a href="http://3.bp.blogspot.com/-mSqgRPt-nfc/Uk2wEIZR_oI/AAAAAAAAInk/e139JGydQU8/s1600/1.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" src="http://3.bp.blogspot.com/-mSqgRPt-nfc/Uk2wEIZR_oI/AAAAAAAAInk/e139JGydQU8/s1600/1.gif" /></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><i></i></span></span><br />
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><i><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><i><br /></i></span></span></i></span></span>
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #b6d7a8;"><i>Fonte:</i>
<i>Caderno do Professor: Ciências, Ensino Fundamental – 8º Ano, Volume 4. </i>São
Paulo: SEE, 2009.</span></span></div>
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Ciências e Saúdehttp://www.blogger.com/profile/01659574780852675493noreply@blogger.com2tag:blogger.com,1999:blog-830458564959320276.post-40425645157064332662013-10-03T00:01:00.000-03:002013-10-03T13:09:30.947-03:00Planetas-anões e outros corpos celestes<div class="separator" style="clear: both; text-align: center;">
<a href="http://3.bp.blogspot.com/-jhm8eBJR2Ec/Uk2M-kXok3I/AAAAAAAAIkk/AMd99t594PI/s1600/1.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #f9cb9c;"><img border="0" height="200" src="http://3.bp.blogspot.com/-jhm8eBJR2Ec/Uk2M-kXok3I/AAAAAAAAIkk/AMd99t594PI/s200/1.gif" width="200" /></span></a></div>
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<span style="color: #f9cb9c;"><br /></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: orange;"><i>Plutão</i></span><span style="color: #f9cb9c;">,
Ceres (anteriormente considerado um asteroide) e Éris, entre outros, são denominados
planetas-anões. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #f9cb9c;"><br /></span></span></div>
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<a href="http://3.bp.blogspot.com/-qpfgedjHCpE/Uk2NFzcar-I/AAAAAAAAIks/Zu0Az_pb288/s1600/1.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #f9cb9c;"><img border="0" height="183" src="http://3.bp.blogspot.com/-qpfgedjHCpE/Uk2NFzcar-I/AAAAAAAAIks/Zu0Az_pb288/s200/1.jpg" width="200" /></span></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #f9cb9c;">Um planeta-anão, assim como um planeta, tem órbita ao redor do
Sol e forma aproximadamente esférica, porém não é o único astro de sua órbita. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #f9cb9c;">Consideram-se
</span><i><span style="color: lime;">planetas-anões</span></i><span style="color: #f9cb9c;"> objetos com massa pequena, insuficiente para limpar a vizinhança
da forma que um planeta faria.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #f9cb9c;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><i><span style="color: lime;">Satélites</span></i><span style="color: #f9cb9c;">
são objetos que giram ao redor dos planetas. Com exceção de Mercúrio e Vênus,
os demais planetas possuem satélites. Os planetas gigantes têm em grande
quantidade, de modo que o número de satélites conhecidos hoje no Sistema Solar
supera uma centena.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><i><span style="color: lime;">Asteroides</span></i><span style="color: #f9cb9c;">
são objetos rochosos de tamanhos que vão de dezenas de metros a até 700 km. A maioria
se localiza entre as órbitas de Marte e Júpiter, formando o chamado cinturão de
asteroides. Mas existem outros não limitados a esse espaço. Hoje já estão
registrados mais de 350 mil asteroides, todos bem menores que a Lua.</span></span></div>
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<a href="http://1.bp.blogspot.com/-qSDMmu7Zc6I/Uk2S8L7dsHI/AAAAAAAAIlM/-wlarLkQLLY/s1600/1.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #f9cb9c;"><img border="0" src="http://1.bp.blogspot.com/-qSDMmu7Zc6I/Uk2S8L7dsHI/AAAAAAAAIlM/-wlarLkQLLY/s1600/1.gif" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: lime;"><i>Meteoroide</i></span><span style="color: #f9cb9c;">
é um fragmento de matéria do espaço cósmico que ao penetrar na atmosfera
terrestre se aquece, produzindo o fenômeno luminoso do </span><i><span style="color: lime;">meteoro</span></i><span style="color: #f9cb9c;"> e que ao atingir
a superfície terrestre recebe o nome de </span><i><span style="color: lime;">meteorito</span></i><span style="color: #f9cb9c;">. </span></span></div>
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<a href="http://1.bp.blogspot.com/-9UgRlBnMYhc/Uk2Ua-ZvTbI/AAAAAAAAIlY/5pqdkmkHlvg/s1600/1.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #f9cb9c;"><img border="0" height="149" src="http://1.bp.blogspot.com/-9UgRlBnMYhc/Uk2Ua-ZvTbI/AAAAAAAAIlY/5pqdkmkHlvg/s200/1.jpg" width="200" /></span></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #f9cb9c;">São objetos pequenos, cujas
dimensões se situam entre as dos asteroides e as dos grãos de poeira, existindo
em quantidade gigantesca. A maioria vaga pelo espaço interplanetário.</span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #f9cb9c;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://2.bp.blogspot.com/-JgowDymU8QM/Uk2VClQDw7I/AAAAAAAAIlg/5SvjFc4P458/s1600/1.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #f9cb9c;"><img border="0" height="200" src="http://2.bp.blogspot.com/-JgowDymU8QM/Uk2VClQDw7I/AAAAAAAAIlg/5SvjFc4P458/s200/1.gif" width="150" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><i><span style="color: lime;">Cometas</span></i><span style="color: #f9cb9c;">
são outro grupo de pequenos corpos do Sistema Solar. Constituídos de uma
mistura de poeira e gelo, quando se aproximam do Sol, parte desse gelo se
transforma em gás. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #f9cb9c;"><br /></span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #f9cb9c;">Forma-se uma nuvem em torno de um núcleo frio e sólido,
chamada coma ou cabeleira. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #f9cb9c;"><br /></span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<a href="http://4.bp.blogspot.com/-hzdckfocGuQ/Uk2ViKHH5tI/AAAAAAAAIlo/PYjAtYyqyqQ/s1600/1.gif" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #f9cb9c;"><img border="0" src="http://4.bp.blogspot.com/-hzdckfocGuQ/Uk2ViKHH5tI/AAAAAAAAIlo/PYjAtYyqyqQ/s1600/1.gif" /></span></a><span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #f9cb9c;">Parte do gás e da poeira da coma é arrastada pelo
vento solar, formando uma cauda que se estende por 100 milhões de km e que
sempre aponta na direção oposta à do Sol. Esse material arrastado é retirado do
cometa, e, após muitas passagens pelas proximidades do Sol, o cometa perde
todas a sua matéria gasosa.</span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #f9cb9c;"><br /></span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #f9cb9c;"><i>Fonte:</i>
TRIVELLATO & MOTOKANE & LISBOA & KANTOR. Ciências, natureza &
cotidiano, 6º ano. São Paulo: FTD, 2012.</span></span></div>
<br />
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<br /></div>
Ciências e Saúdehttp://www.blogger.com/profile/01659574780852675493noreply@blogger.com0tag:blogger.com,1999:blog-830458564959320276.post-33051615963735677152013-09-25T00:01:00.000-03:002013-09-25T00:01:01.346-03:00Galáxia<div class="separator" style="clear: both; text-align: center;">
<a href="http://2.bp.blogspot.com/-CEADcNgkX7o/UkIXoowgMdI/AAAAAAAAIg8/v6yT0HLdK48/s1600/001.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #9fc5e8;"><img border="0" height="247" src="http://2.bp.blogspot.com/-CEADcNgkX7o/UkIXoowgMdI/AAAAAAAAIg8/v6yT0HLdK48/s320/001.gif" width="320" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #9fc5e8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #9fc5e8;">Todas
as estrelas que vemos no céu noturno, incluindo nosso Sol, fazem parte de um
gigantesco aglomerado de estrelas denominado </span><i><span style="color: lime;">galáxia</span></i><span style="color: #9fc5e8;">. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #9fc5e8;"><br /></span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #9fc5e8;">As estrelas que
enxergamos são apenas uma pequena fração daquelas que compõem nossa galáxia,
chamada </span><i><span style="color: lime;">Via Láctea</span></i><span style="color: #9fc5e8;">. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #9fc5e8;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://4.bp.blogspot.com/-NPxZeGmfbWg/UkIX43HNXhI/AAAAAAAAIhE/20QVSOfFxYI/s1600/0002.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #9fc5e8;"><img border="0" height="240" src="http://4.bp.blogspot.com/-NPxZeGmfbWg/UkIX43HNXhI/AAAAAAAAIhE/20QVSOfFxYI/s320/0002.jpg" width="320" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #9fc5e8;">Ela é composta por cerca de 100 bilhões de estrelas. A maior
parte destas estrelas, incluindo o Sol, órbita ao redor do centro da galáxia,
onde estão milhões de estrelas. O Sol se situa na periferia da Via Láctea e, ao
transladar ao redor de seu centro, leva consigo todo o sistema solar (assim
como a Terra, ao girar em torno do Sol, leva a Lua e todos os seus satélites
artificiais).</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #9fc5e8;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://4.bp.blogspot.com/-IeMHc5AjcII/UkIZKH10BhI/AAAAAAAAIhQ/CAOJdQk3KJc/s1600/0agl.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #9fc5e8;"><img border="0" height="176" src="http://4.bp.blogspot.com/-IeMHc5AjcII/UkIZKH10BhI/AAAAAAAAIhQ/CAOJdQk3KJc/s200/0agl.jpg" width="200" /></span></a></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #9fc5e8;">O
Universo é composto por bilhões de galáxias, cada uma delas com bilhões de
estrelas. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #9fc5e8;"><br /></span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #9fc5e8;">As galáxias também orbitam umas ao redor das outras e formam grupos,
chamados </span><i><span style="color: lime;">aglomerados galácticos</span></i><span style="color: #9fc5e8;">. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #9fc5e8;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://3.bp.blogspot.com/-BOzBAppJjj8/UkIambwj2ZI/AAAAAAAAIhc/yfDy25wCybA/s1600/0vl.png" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #9fc5e8;"><img border="0" height="166" src="http://3.bp.blogspot.com/-BOzBAppJjj8/UkIambwj2ZI/AAAAAAAAIhc/yfDy25wCybA/s200/0vl.png" width="200" /></span></a></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #9fc5e8;">Nosso aglomerado galáctico tem um nome nada
criativo, é chamado de </span><span style="color: lime;"><i>Grupo Local</i></span><span style="color: #9fc5e8;">, e é composto por cerca de 30 galáxias. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #9fc5e8;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #9fc5e8;">No
Grupo Local, as duas maiores galáxias são a Via Láctea e a galáxia de
Andrômeda.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #9fc5e8;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://4.bp.blogspot.com/-a1nMSVvkIH4/UkIcUcMjR2I/AAAAAAAAIho/pres2tORVdA/s1600/0ti.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #9fc5e8;"><img border="0" height="99" src="http://4.bp.blogspot.com/-a1nMSVvkIH4/UkIcUcMjR2I/AAAAAAAAIho/pres2tORVdA/s320/0ti.jpg" width="320" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #9fc5e8;">As
galáxias do Universo têm formas diversas. Algumas têm forma </span><i><span style="color: lime;">esférica</span></i><span style="color: #9fc5e8;">, outras se
parecem com </span><i><span style="color: lime;">eclipses</span></i><span style="color: #9fc5e8;"> e ainda outras apresentam belos desenhos </span><i><span style="color: lime;">espirais</span></i><span style="color: #9fc5e8;">. A nossa
Galáxia é do tipo espiral.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #9fc5e8;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://4.bp.blogspot.com/-6d7kQohggnk/UkIfwbS0faI/AAAAAAAAIh0/tyFOyXhNnwM/s1600/010.gif" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #9fc5e8;"><img border="0" src="http://4.bp.blogspot.com/-6d7kQohggnk/UkIfwbS0faI/AAAAAAAAIh0/tyFOyXhNnwM/s1600/010.gif" /></span></a></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #9fc5e8;">As
galáxias se afastam umas das outras. Este fenômeno é chamado </span><i><span style="color: lime;">Expansão do Universo</span></i><span style="color: #9fc5e8;">.</span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #9fc5e8;"><br /></span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #9fc5e8;"><i>Fonte:
Caderno do Professor: Ciências, Ensino Fundamental – 8º Ano, Volume 3.</i> São
Paulo: SEE, 2009.</span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #9fc5e8;"><i>Fonte:</i>
CANTO, Eduardo Leite do. <i>Ciências Naturais: Aprendendo com o cotidiano – 6º
Ano. </i>São Paulo: Moderna, 2009.</span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #9fc5e8;"><i>Fonte:</i>
TRIVELLATO & MOTOKANE & LISBOA & KANTOR. <i>Ciências, natureza &
cotidiano, 6º ano. </i>São Paulo: FTD, 2012.</span></span></div>
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Ciências e Saúdehttp://www.blogger.com/profile/01659574780852675493noreply@blogger.com0tag:blogger.com,1999:blog-830458564959320276.post-70364301513346794262013-09-24T00:01:00.000-03:002013-09-24T09:42:30.243-03:00O Sol e as estrelas<div class="separator" style="clear: both; text-align: center;">
<a href="http://3.bp.blogspot.com/-7sp0T8U8GNA/UkGF1MOFJ3I/AAAAAAAAIgY/4S1BkLuyP2s/s1600/1.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #f9cb9c;"><img border="0" height="200" src="http://3.bp.blogspot.com/-7sp0T8U8GNA/UkGF1MOFJ3I/AAAAAAAAIgY/4S1BkLuyP2s/s200/1.gif" width="200" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #f9cb9c;"><br /></span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #f9cb9c;">O </span><span style="color: orange;"><i>Sol</i></span><span style="color: #f9cb9c;"> também é uma estrela. As outras estrelas parecem tão pequenas e fracas
comparadas com o nosso Sol porque elas estão muito mais longe de nós.</span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #f9cb9c;"><br /></span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #f9cb9c;">A
distância entre o Sol e as outras estrelas é tão grande que usamos outra unidade
de medida de distâncias entre os astros: o ano-luz.</span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #f9cb9c;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://3.bp.blogspot.com/-8BtOzeucE4A/UkGHSPE02JI/AAAAAAAAIgk/t3SSwAzoAYo/s1600/01.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><span style="color: #f9cb9c;"><img border="0" height="167" src="http://3.bp.blogspot.com/-8BtOzeucE4A/UkGHSPE02JI/AAAAAAAAIgk/t3SSwAzoAYo/s320/01.jpg" width="320" /></span></a></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><i><span style="color: #674ea7;">Ano-luz</span></i><span style="color: #f9cb9c;">
é uma unidade de comprimento que corresponde à distância percorrida pela luz em
um ano no vácuo. </span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #f9cb9c;"><br /></span></span></div>
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<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #f9cb9c;">Em um ano, ela percorreria 9,46 trilhões de quilômetros.</span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #f9cb9c;"><br /></span></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://3.bp.blogspot.com/-bDYKKyoPwJg/UkGICYtCXpI/AAAAAAAAIgs/s2DfITGILVU/s1600/02.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span style="color: #f9cb9c;"><img border="0" src="http://3.bp.blogspot.com/-bDYKKyoPwJg/UkGICYtCXpI/AAAAAAAAIgs/s2DfITGILVU/s1600/02.gif" /></span></a></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #f9cb9c;">Ao
redor do Sol há um grande vazio de aproximadamente 4 anos-luz em todas as
direções. Existe a possibilidade de que cada estrela que vemos no céu seja o
centro de um sistema planetário, como o sistema solar, e que já foram
encontradas evidências da existência de mais de duas centenas de planetas
girando ao redor de outras estrelas. Tais planetas são chamados de </span><i><span style="color: orange;">extra-solares</span></i><span style="color: #f9cb9c;">.</span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #f9cb9c;"><br /></span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #f9cb9c;"><i>Fonte:
Caderno do Professor: Ciências, Ensino Fundamental – 8º Ano, Volume 3. </i>São
Paulo: SEE, 2009.</span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #f9cb9c;"><i>Fonte:</i>
CANTO, Eduardo Leite do. <i>Ciências Naturais: Aprendendo com o cotidiano – 6º
Ano.</i> São Paulo: Moderna, 2009.</span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<span style="font-family: 'Times New Roman', serif; font-size: large; line-height: 115%;"><span style="color: #f9cb9c;"><i>Fonte:</i>
TRIVELLATO & MOTOKANE & LISBOA & KANTOR. <i>Ciências, natureza &
cotidiano, 6º ano.</i> São Paulo: FTD, 2012.</span></span></div>
<div class="MsoNormal" style="margin-bottom: .0001pt; margin-bottom: 0cm; text-align: justify;">
<br /></div>
Ciências e Saúdehttp://www.blogger.com/profile/01659574780852675493noreply@blogger.com0