FUVEST 2006

Questão 44947

(FUVEST - 2006) A relação entre tensão e corrente de uma lâmpada L, como a usada em automóveis, foi obtida por meio do circuito esquematizado na figura 1, onde G representa um gerador de tensão variável. Foi medido o valor da corrente indicado pelo amperímetro A, para diferentes valores da tensão medida pelo voltímetro V, conforme representado pela curva L no Gráfico 1, da folha de resposta. O circuito da figura 1 é, então, modificado, acrescentando-se um resistor R de resistência 6,0 Ω em série com a lâmpada L, conforme esquematizado na figura 2.

a) Construa, no Gráfico 2 abaixo, o gráfico da potência dissipada na lâmpada, em função da tensão U entre seus terminais, para U variando desde 0 até 12 V.

b) Construa, no Gráfico 1 abaixo, o gráfico da corrente no resistor R em função da tensão U aplicada em seus terminais, para U variando desde 0 até 12 V.

c) Considerando o circuito da figura 2, construa, no Gráfico 3 da folha de resposta, o gráfico da corrente indicada pelo amperímetro em função da tensão U indicada pelo voltímetro, quando a corrente varia desde 0 até 2 A.

Questão 44948

(FUVEST - 2006) Um procedimento para estimar o campo magnético de um ímã baseia-se no movimento de uma grande espira condutora E através desse campo. A espira retangular E é abandonada à ação da gravidade entre os pólos do ímã de modo que, enquanto a espira cai, um de seus lados horizontais (apenas um) corta perpendicularmente as linhas de campo. A corrente elétrica induzida na espira gera uma força eletromagnética que se opõe a seu movimento de queda, de tal forma que a espira termina atingindo uma velocidade V constante. Essa velocidade é mantida enquanto esse lado da espira estiver passando entre os pólos do ímã. A figura representa a configuração usada para medir o campo magnético, uniforme e horizontal, criado entre os pólos do ímã. As características da espira e do ímã estão apresentadas na tabela. Para a situação em que um dos lados da espira alcança a velocidade constante V = 0,40 m/s entre os pólos do ímã, determine:

a) A intensidade da força eletromagnética F, em N, que age sobre a espira, de massa M, opondo-se à gravidade no seu movimento de queda a velocidade constante.

b) O trabalho realizado pela força de gravidade por unidade de tempo (potência), que é igual à potência P dissipada na espira, em watts.

c) A intensidade da corrente elétrica i, em amperes, que percorre a espira, de resistência R.

d) O campo magnético B, em tesla, existente entre os pólos do ímã.

Questão 44981

(FUVEST - 2006 - 1 FASE )

Quimicamente falando, não se deve tomar água ..................., mas apenas água ................... . A água .................. inúmeros sais, por exemplo, o cloreto de .................., o mais abundante na água do mar. Em regiões litorâneas, ameniza variações bruscas de temperatura, graças à sua capacidade de armazenar grande quantidade de energia térmica, o que se deve ao seu alto ..................... . Na forma de suor, sua evaporação abaixa a temperatura do corpo humano, para o que contribui seu elevado .................... . Completa-se corretamente o texto, obedecendo-se a ordem em que as lacunas aparecem, por:

Questão 44982

(FUVEST - 2006 - 1 FASE )

Em determinado processo industrial, ocorre uma transformação química, que pode ser representada pela equação genérica

x A_(g) + y B_(g) ⇌ z C_(g)

em que x, y e z são, respectivamente, os coeficientes estequiométricos das substâncias A, B e C.

O gráfico representa a porcentagem, em mols, de C na mistura, sob várias condições de pressão e temperatura. Com base nesses dados, pode-se afirmar que essa reação é

Questão 45005

(FUVEST - 2006 - 1 FASE)

“CHINA has begun to enter the age of mass car consumption. This is a great and historic advance.” So proclaimed the state-run news agency, Xinhua, last year. Environmentalists may feel a twinge of fear at this burgeoning romance with motoring. But a rapid social and economic transformation is under way in urban China, and the car is steering it.

In 2002 demand for cars in China soared by 56%, far more than even the rosiest projections. The next year growth quickened to 75%, before slowing in 2004 (when the government tightened rules on credit for car purchases) to around 15%. But in a sluggish global market, China’s demand remains mesmerising. Few expect this year’s growth to dip below 10%. As long as the economy goes on galloping at its current high-singledigit clip, many expect car sales to increase by 10-20% annually for several years to come."

The Economist, June 4th 2005.

According to the passage, Xinhua 

Questão 45006

(FUVEST - 2006 - 1ª FASE)

“CHINA has begun to enter the age of mass car consumption. This is a great and historic advance.” So proclaimed the state-run news agency, Xinhua, last year. Environmentalists may feel a twinge of fear at this burgeoning romance with motoring. But a rapid social and economic transformation is under way in urban China, and the car is steering it.

In 2002 demand for cars in China soared by 56%, far more than even the rosiest projections. The next year growth quickened to 75%, before slowing in 2004 (when the government tightened rules on credit for car purchases) to around 15%. But in a sluggish global market, China’s demand remains mesmerising. Few expect this year’s growth to dip below 10%. As long as the economy goes on galloping at its current high-singledigit clip, many expect car sales to increase by 10-20% annually for several years to come."

The Economist, June 4th 2005.

The passage suggests that China’s embrace of the car is likely to make environmentalists 

Questão 45007

(FUVEST - 2006 - 1 FASE )

“CHINA has begun to enter the age of mass car consumption. This is a great and historic advance.” So proclaimed the state-run news agency, Xinhua, last year. Environmentalists may feel a twinge of fear at this burgeoning romance with motoring. But a rapid social and economic transformation is under way in urban China, and the car is steering it.

In 2002 demand for cars in China soared by 56%, far more than even the rosiest projections. The next year growth quickened to 75%, before slowing in 2004 (when the government tightened rules on credit for car purchases) to around 15%. But in a sluggish global market, China’s demand remains mesmerising. Few expect this year’s growth to dip below 10%. As long as the economy goes on galloping at its current high-singledigit clip, many expect car sales to increase by 10-20% annually for several years to come."

The Economist, June 4th 2005.

The passage says that the demand for cars in China 

Questão 45008

(FUVEST - 2006 - 1 FASE )

“CHINA has begun to enter the age of mass car consumption. This is a great and historic advance.” So proclaimed the state-run news agency, Xinhua, last year. Environmentalists may feel a twinge of fear at this burgeoning romance with motoring. But a rapid social and economic transformation is under way in urban China, and the car is steering it.

In 2002 demand for cars in China soared by 56%, far more than even the rosiest projections. The next year growth quickened to 75%, before slowing in 2004 (when the government tightened rules on credit for car purchases) to around 15%. But in a sluggish global market, China’s demand remains mesmerising. Few expect this year’s growth to dip below 10%. As long as the economy goes on galloping at its current high-singledigit clip, many expect car sales to increase by 10-20% annually for several years to come."

The Economist, June 4th 2005.

Which of these statements is true according to the passage? 

Questão 45009

(FUVEST - 2006 - 1 FASE )

Australians are not known for their love of boat people.

They famously turned away a small group of Afghan refugees at the height of the war and rather amusingly, ran a scare campaign featuring crocodiles and sharks to deter would-be immigrants. But if global warming continues at its current rate, neighbouring Pacific islands could be lost to floods and Australia will be facing a new kind of intruder: climate refugees.

Although the Red Cross produced a report four years ago estimating that 58 per cent of refugees are caused by environmental factors, no one has made any attempt to tackle the issue. Oxford University’s Norman Myers recently claimed that there could be an estimated 150 million environmental refugees within the next 50 years, and half of these could land on Australia’s doorstep. But the UN refuses to grant them refugee status, and aid groups and environmentalists squabble over whose responsibility they are.

DAZED & CONFUSED July 2005

According to the passage, Australians 

Questão 45010

(FUVEST - 2006 - 1 FASE )

Australians are ot known for their love of boat people. 

They famously turned away a small group of Afghan refugees at the height of the war and rather amusingly, ran a scare campaign featuring crocodiles and sharks to deter would-be immigrants. But if global warming continues at its current rate, neighbouring Pacific islands could be lost to floods and Australia will be facing a new kind of intruder: climate refugees.

Although the Red Cross produced a report four years ago estimating that 58 per cent of refugees are caused by environmental factors, no one has made any attempt to tackle the issue. Oxford University’s Norman Myers recently claimed that there could be an estimated 150 million environmental refugees within the next 50 years, and half of these could land on Australia’s doorstep. But the UN refuses to grant them refugee status, and aid groups and environmentalists squabble over whose responsibility they are.

DAZED & CONFUSED July 2005

The passage says that Afghan refugees