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Considere a figura a seguir que representa uma caixa cúbica que tem, em uma de suas faces, um espelho plano com a face espelhada (refletora) voltada para dentro do cubo.
Se um raio luminoso incidir pelo vértice C e atingir o centro O do espelho, podemos afirmar que o raio refletido atingirá o vértice
Nas figuras apresentadas, observam-se três blocos idênticos e de mesma densidade que flutuam em líquidos diferentes cujas densidades são, respectivamente, d1 , d2 e d3 .
A relação correta entre as densidades dos líquidos está melhor representada pela alternativa:
Num laboratório de física, o professor entrega aos seus alunos 2 pilhas e um multímetro e pede que eles obtenham, através do multímetro, a tensão elétrica de cada uma das pilhas.
Os alunos, ao fazerem a leitura, anotam os seguintes resultados:
PILHA 1: V1 = 1,54 volts e PILHA 2: V2 = 1,45 volts.
Na sequência, o professor pede que coloquem as pilhas associadas em série corretamente e que façam novamente a medida, porém alguns alunos procedem de maneira errada, associando os polos positivos, conforme figura a seguir.
A leitura das medidas feita pelos alunos que associaram corretamente as pilhas e por aqueles que as
associaram incorretamente foi, respectivamente, em volts
Duas placas planas, paralelas, horizontais e carregadas com sinais opostos, são dispostas formando entre si um campo elétrico uniforme, e, nas suas laterais, encontram-se dois polos de um ímã formando um campo magnético uniforme, como na figura apresentada.
Abandonando-se um elétron (e) no ponto médio dos dois campos e desprezando-se as velocidades
relativísticas e o campo gravitacional, pode-se afirmar que a posição mais provável que esse elétron atingirá
será uma região nas proximidades do ponto
O Centro Paula Souza administra Escolas Técnicas (Etecs) e Faculdades de Tecnologia (Fatecs) estaduais em 149 municípios, no Estado de São Paulo.
Para participar de um simpósio sobre educação a distância, a Fatec São Paulo enviou cinco alunos, sendo dois homens; a Fatec Sorocaba enviou três alunos, sendo uma mulher; e a Fatec da Baixada Santista enviou quatro alunos, sendo dois homens. Para a abertura desse simpósio, será selecionada, ao acaso, uma dessas Fatecs e dela se escolherá, também ao acaso, um aluno para representar o Centro Paula Souza. A probabilidade de que o aluno escolhido seja uma mulher é
Segundo informações da Sabesp, até 2 anos de idade, 80% do nosso corpo é formado de água; aos 5 anos, essa porcentagem cai para 70% até que, depois dos 60 anos, temos apenas 58% de água no organismo.
Nessas condições, uma pessoa com mais de 60 anos tem, em relação à quantidade de água no organismo que possuía aos 2 anos de idade, uma redução de x% de água. O valor de x é
A TOOL FOR SPIES
When Iran’s opposition protesters used Twitter and other forms of social media last year to let the world know about their regime’s brutal post election crackdown, activists praised Twitter as the tool of revolution and freedom. But now Venezuelan President Hugo Chávez has figured out how to twist this tool into one of repression. Though as recently as this past January Chávez was decrying Twitter as a weapon of terrorists, he’s since turned into an avid Twitterer himself ( his account, the country’s most popular, boasted more than half a million followers at press time ), as well as a devoted Facebook user and blogger.
Far from embracing the democratic spirit of the Web, though, the Venezuelan strongman is using his accounts and blog to exhort people to spy on each other. At the launch of his Twitter account, Chávez enjoined the Boliviarian faithful to use it to keep an eye on state enemies, namely the wealthy. My Twitter account is open for you to denounce them, “ Chávez announced on his television program. El Presidente has hired a staff of 200 to deal with tweeted “requests, denunciations, and other problems,” which have resulted in actions against allegedly credit-stingy banks and currency speculators. He’s now considering going a step further and ruling that all Venezuelan Web sites must move from U.S.- based servers to domestic ones - which would, of course, make them far easier to control. Big Brother would be proud.
(Newsweek – June 14, 2010. By Mac Margolis and Alex Marin)
O verbo auxiliar must em - ... and ruling that all Venezuelan Web sites must move from U.S.- based servers to domestic ones… - transmite a ideia deA TOOL FOR SPIES
When Iran’s opposition protesters used Twitter and other forms of social media last year to let the world know about their regime’s brutal post election crackdown, activists praised Twitter as the tool of revolution and freedom. But now Venezuelan President Hugo Chávez has figured out how to twist this tool into one of repression. Though as recently as this past January Chávez was decrying Twitter as a weapon of terrorists, he’s since turned into an avid Twitterer himself ( his account, the country’s most popular, boasted more than half a million followers at press time ), as well as a devoted Facebook user and blogger.
Far from embracing the democratic spirit of the Web, though, the Venezuelan strongman is using his accounts and blog to exhort people to spy on each other. At the launch of his Twitter account, Chávez enjoined the Boliviarian faithful to use it to keep an eye on state enemies, namely the wealthy. My Twitter account is open for you to denounce them, “ Chávez announced on his television program. El Presidente has hired a staff of 200 to deal with tweeted “requests, denunciations, and other problems,” which have resulted in actions against allegedly credit-stingy banks and currency speculators. He’s now considering going a step further and ruling that all Venezuelan Web sites must move from U.S.- based servers to domestic ones - which would, of course, make them far easier to control. Big Brother would be proud.
(Newsweek – June 14, 2010. By Mac Margolis and Alex Marin)
Segundo o texto, o presidente da Venezuela está usando suas contas da internet e seu ” blog” com o intuito deA TOOL FOR SPIES
When Iran’s opposition protesters used Twitter and other forms of social media last year to let the world know about their regime’s brutal post election crackdown, activists praised Twitter as the tool of revolution and freedom. But now Venezuelan President Hugo Chávez has figured out how to twist this tool into one of repression. Though as recently as this past January Chávez was decrying Twitter as a weapon of terrorists, he’s since turned into an avid Twitterer himself ( his account, the country’s most popular, boasted more than half a million followers at press time ), as well as a devoted Facebook user and blogger.
Far from embracing the democratic spirit of the Web, though, the Venezuelan strongman is using his accounts and blog to exhort people to spy on each other. At the launch of his Twitter account, Chávez enjoined the Boliviarian faithful to use it to keep an eye on state enemies, namely the wealthy. My Twitter account is open for you to denounce them, “ Chávez announced on his television program. El Presidente has hired a staff of 200 to deal with tweeted “requests, denunciations, and other problems,” which have resulted in actions against allegedly credit-stingy banks and currency speculators. He’s now considering going a step further and ruling that all Venezuelan Web sites must move from U.S.- based servers to domestic ones - which would, of course, make them far easier to control. Big Brother would be proud.
(Newsweek – June 14, 2010. By Mac Margolis and Alex Marin)
No segundo parágrafo, o pronome them em - My Twitter account is open for you to denounce them - refere-se aA TOOL FOR SPIES
When Iran’s opposition protesters used Twitter and other forms of social media last year to let the world know about their regime’s brutal post election crackdown, activists praised Twitter as the tool of revolution and freedom. But now Venezuelan President Hugo Chávez has figured out how to twist this tool into one of repression. Though as recently as this past January Chávez was decrying Twitter as a weapon of terrorists, he’s since turned into an avid Twitterer himself ( his account, the country’s most popular, boasted more than half a million followers at press time ), as well as a devoted Facebook user and blogger.
Far from embracing the democratic spirit of the Web, though, the Venezuelan strongman is using his accounts and blog to exhort people to spy on each other. At the launch of his Twitter account, Chávez enjoined the Boliviarian faithful to use it to keep an eye on state enemies, namely the wealthy. My Twitter account is open for you to denounce them, “ Chávez announced on his television program. El Presidente has hired a staff of 200 to deal with tweeted “requests, denunciations, and other problems,” which have resulted in actions against allegedly credit-stingy banks and currency speculators. He’s now considering going a step further and ruling that all Venezuelan Web sites must move from U.S.- based servers to domestic ones - which would, of course, make them far easier to control. Big Brother would be proud.
(Newsweek – June 14, 2010. By Mac Margolis and Alex Marin)
No primeiro parágrafo, a conjunção though em - Though as recently as this past January... - pode ser substituída, sem prejuízo para o sentido do texto porA TOOL FOR SPIES
When Iran’s opposition protesters used Twitter and other forms of social media last year to let the world know about their regime’s brutal post election crackdown, activists praised Twitter as the tool of revolution and freedom. But now Venezuelan President Hugo Chávez has figured out how to twist this tool into one of repression. Though as recently as this past January Chávez was decrying Twitter as a weapon of terrorists, he’s since turned into an avid Twitterer himself ( his account, the country’s most popular, boasted more than half a million followers at press time ), as well as a devoted Facebook user and blogger.
Far from embracing the democratic spirit of the Web, though, the Venezuelan strongman is using his accounts and blog to exhort people to spy on each other. At the launch of his Twitter account, Chávez enjoined the Boliviarian faithful to use it to keep an eye on state enemies, namely the wealthy. My Twitter account is open for you to denounce them, “ Chávez announced on his television program. El Presidente has hired a staff of 200 to deal with tweeted “requests, denunciations, and other problems,” which have resulted in actions against allegedly credit-stingy banks and currency speculators. He’s now considering going a step further and ruling that all Venezuelan Web sites must move from U.S.- based servers to domestic ones - which would, of course, make them far easier to control. Big Brother would be proud.
(Newsweek – June 14, 2010. By Mac Margolis and Alex Marin)
Considere as afirmações a seguir.
I. Chávez é um usuário ávido do “Twitter”.
II. Segundo os autores do texto, o “Twitter” é uma arma de terroristas.
III. Chávez é um usuário devotado do “Facebook”.
É correto o que se afirma em
A TOOL FOR SPIES
When Iran’s opposition protesters used Twitter and other forms of social media last year to let the world know about their regime’s brutal post election crackdown, activists praised Twitter as the tool of revolution and freedom. But now Venezuelan President Hugo Chávez has figured out how to twist this tool into one of repression. Though as recently as this past January Chávez was decrying Twitter as a weapon of terrorists, he’s since turned into an avid Twitterer himself ( his account, the country’s most popular, boasted more than half a million followers at press time ), as well as a devoted Facebook user and blogger.
Far from embracing the democratic spirit of the Web, though, the Venezuelan strongman is using his accounts and blog to exhort people to spy on each other. At the launch of his Twitter account, Chávez enjoined the Boliviarian faithful to use it to keep an eye on state enemies, namely the wealthy. My Twitter account is open for you to denounce them, “ Chávez announced on his television program. El Presidente has hired a staff of 200 to deal with tweeted “requests, denunciations, and other problems,” which have resulted in actions against allegedly credit-stingy banks and currency speculators. He’s now considering going a step further and ruling that all Venezuelan Web sites must move from U.S.- based servers to domestic ones - which would, of course, make them far easier to control. Big Brother would be proud.
(Newsweek – June 14, 2010. By Mac Margolis and Alex Marin)
De acordo com o texto, em janeiro deste ano, Hugo ChávezUma forma de evitar a poluição ambiental causada pelo descarte de óleo de cozinha usado é reaproveitá-lo para produzir sabões, que são sais de ácidos carboxílicos. Para tanto, faz-se reagir o óleo com solução aquosa fortemente alcalina de NaOH e/ou KOH.
Nessa reação, conhecida como reação de saponificação, forma-se também um outro produto que é o
A cor das flores de diversas plantas ocorre devido à presença de substâncias, como as antocianinas, que atuam como indicadores ácido-base. Assim, conforme o pH do solo, a cor das flores pode variar. É o caso das hortênsias, que apresentam cor azul em solos ácidos e rosa em solos alcalinos.
Caso uma pessoa queira cultivar hortênsias de cor rosa, em um jardim cujo solo seja ácido, ela deverá corrigir o pH e, para isso, poderá misturar à terra, em quantidade adequada,
Um veículo de passeio, movido a gasolina, deixou a capital paulista com o tanque cheio, dirigindo-se a uma cidade do interior situada a 480 km, na região noroeste do estado. Ao final da viagem, verificou-se que o consumo médio do veículo foi de 16 km por litro de combustível.
Admitindo-se que a composição média da gasolina seja dada pela fórmula C8 H18 e que a combustão seja completa, conclui-se que o volume de CO2 , em litros, medido nas CATP e lançado ao ar durante a viagem foi de, aproximadamente,
Dados
Volume molar de gás nas CATP = 25 L / mol
Densidade da gasolina = 8 x 102 g / L
Massas molares em g / mol:
C = 12; H = 1 e O = 16
Os elementos cloro (Z = 17) e iodo (Z = 53) pertencem ao mesmo grupo da tabela periódica. Assim, átomos neutros desses elementos apresentam igual
I. número de prótons;
II. número de elétrons na camada de valência;
III. eletronegatividade.
É correto o que se afirma em
Leia com atenção os versos de cordel a seguir.
“Ele matava de brincadeira,
Por pura perversidade,
E alimentava os famintos
Com amor e caridade.”
“Por onde Lampião anda,
Minhoca fica valente,
Macaco briga com onça
E o carneiro não amansa.”
(HOSBAWN, Eric. Bandidos. Rio de Janeiro: Editora Forense-Universitária, 1976. p. 55.)
Nesses versos, a figura de Virgulino Ferreira da Silva, o Lampião, apresenta algumas características
conflitantes e muito valorizadas dos grupos de cangaceiros que circulavam pelo sertão, na primeira metade
do século XX. Essas características, que despertavam respeito e identificação da população pobre do sertão
com esses grupos, era(m)
