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Texto associado
Read the text to answer question. It wasn’t the first attempt to deter foreign students, but it could have been the most disruptive. The U.S. Immigration and Customs Enforcement agency sought to bar visas for international students at colleges that offer only virtual instruction. Students on existing visas would have had to transfer to a school that offers at least some in-person teaching if they wanted to remain in the U.S. The policy swiftly brought together a broad coalition of colleges, states and businesses that opposed it. “The overwhelming negative reaction to this proposal in a very short period of time shows that the administration really struck a nerve with this,” says Terry Hartle, from the American Council on Education. “It’s unprecedented for that many colleges and universities to file suit against the federal government.” (Bloomberg Businessweek, 20.07.2020. Adapted.)

The expressions from the first paragraph “could have been” and “would have had” help understand that, as to exclusively virtual instruction in U.S. universities and colleges,

A the government has backed down from its proposal to bar visas for foreign students.
B the barrier against international students is still a possibility.
C foreign students have no alternative but to transfer to a new school.
D impeding foreign students to attend school in the U.S. will disrupt their lives.
E the veto of the proposal resulted from coordinated action by colleges, states and the police.
Texto associado
Read the text to answer question. It wasn’t the first attempt to deter foreign students, but it could have been the most disruptive. The U.S. Immigration and Customs Enforcement agency sought to bar visas for international students at colleges that offer only virtual instruction. Students on existing visas would have had to transfer to a school that offers at least some in-person teaching if they wanted to remain in the U.S. The policy swiftly brought together a broad coalition of colleges, states and businesses that opposed it. “The overwhelming negative reaction to this proposal in a very short period of time shows that the administration really struck a nerve with this,” says Terry Hartle, from the American Council on Education. “It’s unprecedented for that many colleges and universities to file suit against the federal government.” (Bloomberg Businessweek, 20.07.2020. Adapted.)

The expression from the second paragraph “struck a nerve” means, in the context:

A made the wrong decision.
B triggered nervous breakdowns.
C created an unmanageable situation.
D provoked a student uprising.
E stirred anger and outrage.

The American embassy escaped the blast in Beirut’s port unscathed. Many Western countries either have missions in the city centre or diplomats who live in the area. The wife of the Dutch ambassador was killed, as was a German diplomat. But America’s embassy sits in the mountain village of Awkar, five miles from the port. Security measures are onerous, a hangover from the bombing of the American embassy in Beirut in 1983, which killed 63 people. It took a week before the ambassador, Dorothy Shea, a career diplomat, toured the port. Even on social media it has been far quieter than other foreign powers. (www.economist.com, 13.08.2020. Adapted.) The descriptions in the paragraph

A underscore the extent of the damage brought about by a bombing in Beirut last August.
B display differences in approach between American diplomacy and other countries’ in the moments shortly following the explosion.
C depict covert and behind-the-scenes divergences between the American and the Lebanese governments.
D accuse the American government of omission for fear of a new threat against American citizens.
E point out the low visibility of America’s diplomacy in the Beirut’s event due to both, the Embassy’s location and attitude.
Texto associado
Read the text to answer question. The formula for calculating people’s environmental footprint is simple, but widely misunderstood: Impact = Population x Affluence x Technology (I = PAT). The global rate of consumption growth, before the pandemic, was 3% a year. Population growth is 1%. Some people assume this means that the rise in population bears one-third of the responsibility for increased consumption. But population growth is overwhelmingly concentrated among the world’s poorest people, who have scarcely any A or T to multiply their P. Yet it is widely used as a blanket explanation of environment breakdown. Panic about population growth enables the people most responsible for the impacts of rising consumption (the affluent) to blame those who are least responsible. (George Monbiot. www.theguardian.com, 26.08.2020. Adapted.)

The text states that

A population growth has proven to have overwhelming impact on environmental degradation.
B population growth is the main determinant in consumption growth.
C the wealthy should be most directly accountable for global ecological damage.
D the poor should be most directly accountable for global ecological damage.
E poor access to technology and other resources reduces environmental breakdown.
Texto associado
Read the text to answer question. The formula for calculating people’s environmental footprint is simple, but widely misunderstood: Impact = Population x Affluence x Technology (I = PAT). The global rate of consumption growth, before the pandemic, was 3% a year. Population growth is 1%. Some people assume this means that the rise in population bears one-third of the responsibility for increased consumption. But population growth is overwhelmingly concentrated among the world’s poorest people, who have scarcely any A or T to multiply their P. Yet it is widely used as a blanket explanation of environment breakdown. Panic about population growth enables the people most responsible for the impacts of rising consumption (the affluent) to blame those who are least responsible. (George Monbiot. www.theguardian.com, 26.08.2020. Adapted.)

The formula for calculating people’s environmental footprint

A is inadequate because it does not capture all sides of the relation between population growth and environmental degradation.
B has proved inefficient to properly relate world’s population and ecological damage during the present pandemic times.
C has been wrongly used as the only explanation of causes for ecological breakdown.
D has demonstrated that a 3% rise in the world population represents 1% of the responsibility for consumption growth.
E is often too plainly interpreted as equating population growth with an equivalent increase in ecological damage and in consumption.

Um motorista, que conduz seu caminhão com velocidade constante de 25 m/s (90 km/h) por uma estrada retilínea, plana e horizontal, aciona os freios quando percebe um ônibus a sua frente deslocando-se lentamente no mesmo sentido, com velocidade constante de 5 m/s (18 km/h). Supondo-se que a distância entre o caminhão e o ônibus no instante em que o motorista do caminhão aciona os freios é de 80 m, que o ônibus não altera sua velocidade e que não há mudança nas direções dos movimentos de ambos os veículos, o módulo da aceleração mínima, admitida constante, que deve ser imprimida ao caminhão para evitar a colisão é

A 1,5 m/s².
B 2,5 m/s².
C 3,0 m/s².
D 3,5 m/s².
E 4,0 m/s².

Um bloco de massa 100 g, apoiado sobre uma superfície horizontal sem atrito, está preso à extremidade de uma mola de constante elástica 1,6 N/m, que tem a outra extremidade presa a um suporte vertical fixo. O bloco realiza movimento harmônico simples, e sua posição x é dada pela equação x = 0,20 cos (4,0·t + 0,80). A máxima aceleração a que o bloco está sujeito nesse movimento tem módulo igual a

A 0,2 m/s².
B 0,4 m/s².
C 0,8 m/s².
D 1,6 m/s².
E 3,2 m/s².

Uma bola de massa 60 g é solta, a partir do repouso, de uma altura igual a 80 cm. Após colidir com o solo, a bola sobe verticalmente até a altura de 45 cm. Considerando-se a aceleração gravitacional igual a 10 m/s² e desprezando-se a resistência do ar, a intensidade do impulso recebido pela bola na colisão com o solo foi de

A 0,12 N·s.
B 0,21 N·s.
C 0,35 N·s.
D 0,42 N·s.
E 0,64 N·s.

Um asteroide com tamanho semelhante ao de um pequeno automóvel passou perto da Terra no último domingo. Chamado de 2020QG, ele esteve a 2 950 quilômetros do planeta, uma distância pequena em termos astronômicos. ( O Estado de S.Paulo , 20.08.2020. Adaptado.) Considere que a constante de gravitação universal é igual a 6,7 × 10 –11 N·m 2 /kg 2 , que a massa da Terra é 6,0 × 10 24 kg e que a menor distância entre o centro do asteroide e o centro da Terra foi, aproximadamente, 1,0 × 10 7 m (resultado da soma do raio da Terra com a distância do asteroide ao planeta). Uma vez que o asteroide não foi capturado gravitacionalmente pela Terra, sua velocidade, ao passar pelo ponto mais próximo da Terra, era de, no mínimo,

A 4,6 × 10 3 m/s.
B 6,4 × 10 3 m/s.
C 8,8 × 10 3 m/s.
D 3,2 × 10 4 m/s.
E 7,3 × 10 4 m/s.

Um recipiente graduado de vidro, de volume interno igual a 800 cm 3 , contém certa quantidade de glicerina, ambos a 20 ºC, temperatura para a qual o recipiente foi calibrado. Aquecendo-se o conjunto, nota-se que a indicação do volume de glicerina no interior do recipiente não se altera enquanto a substância estiver no estado líquido. Sendo os coeficientes de dilatação volumétrica do vidro e da glicerina, respectivamente, iguais a 3,0 × 10 –5 ºC –1 e 5,0 × 10 –4 ºC –1 , a quantidade de glicerina no recipiente, a temperatura de 20 ºC, é igual a

A 24 cm 3 .
B 32 cm 3 .
C 48 cm 3 .
D 56 cm 3 .
E 64 cm 3 .