Foram encontradas 120 questões.
Considere um observador frente a três anteparos, em um meio homogêneo e transparente, cada um com um orifício em seu respectivo centro, conforme mostra a figura que se segue. Através desses orifícios, o observador consegue enxergar a chama de uma vela devido a um princípio da Óptica Geométrica denominado ____________.

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Um trapézio tem 12 cm de base média e 7 cm de altura. A área desse quadrilátero é ______ !$ cm^2 !$.
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Read the text and answer question.
When “Star Wars: The Force Awakens” opens on Dec. 18 and, for the first time in nearly a decade, moviegoers can return to that galaxy of long ago and far, far away, they will find that it contains two new stars. The film, which is directed by J. J. Abrams and continues the interstellar saga of Luke Skywalker, Princess Leia and Han Solo some 30 years after the events of “Return of the Jedi” (1983), is also a launching pad for two young actors who are barely half as old as the “Star Wars” franchise itself. Daisy Ridley, who plays a mysterious scavenger named Rey, and John Boyega, who plays a disaffected stormtrooper named Finn, are among the new heroes of “The Force Awakens” and are bracing themselves for the biggest roles of their careers.
(www.nytimes.com.br)
The word themselves, in bold in the text, refers to ____.
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Na tabela de dados brutos tem-se as massas, em quilogramas, de 15 clientes de uma clínica médica. Organizando os dados desta tabela pode-se verificar que a amplitude do rol, em kg, é
83 72 86 74 88
57 81 91 65 82
59 55 49 73 74
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Sejam m, n e b números reais positivos, com !$ b ≠ 1 !$. Se !$ \log_b m=x !$ e se !$ \log_b n=y !$, então !$ \log_b(m.n)+ \log_b \left( \large{n \over m} \right) !$ é igual a
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Leia o texto abaixo e responda a questão.
Salve, lindo pendão¹ da esperança,
Salve, símbolo augusto² da paz!
Tua nobre presença à lembrança
A grandeza da pátria nos traz.
(trecho do Hino à Bandeira – letra de Olavo Bilacmúsica de Francisco Braga)
Glossário:
¹ Pendão – bandeira, flâmula
² Augusto – nobre
O trecho “Tua nobre presença”, no contexto em que se insere, do ponto de vista sintático, se classifica como
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Read the text and answer question.
Heathrow expansion should face strict environmental conditions, say MPs.
Final government approval for the expansion of Heathrow should be withheld until Europe’s busiest airport can demonstrate that it accepts and will comply with key environmental conditions, a parliamentary committee has concluded.
MPs on the environmental audit committee have been hearing evidence on the likely carbon emissions, air quality and noise levels after the government-appointed Airports Commission recommended a third runway at Heathrow as the preferred plan for London airport expansion.
(Adapted from www.theguardian/ environment. Acessed on 01/12/2015)
Write true (T) or false (F), according to the text:
( ) The expansion of Heathrow airport ought to be blocked until the busiest airport complies with key environmental conditions.
( ) The expansion of Heathrow should begin once Europe’s busiest airport may accept other conditions for weather.
( ) Europe’s busiest airport can accept this change under two conditions: better air quality and lower noise levels.
( ) Heathrow airport can choose the best alternative for environmental conditions.
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Read the text and answer the question.
Illegal levels of arsenic and mercury polluted a river in the days after a dam burst at an iron ore mine this month Brazil’s worst environmental disaster, according to tests by a state water agency, the Institute for Water Management in Minas Gerais. The agency found arsenic levels more than 10 times above the legal limit in one place the river, the Rio Doce, after the dam burst on Nov. 5, killing at least 13 people. Mercury slightly above the permitted level was also found in one area. Samarco, the mine operator, and its co-owners, BHP Billiton and Vale, have repeatedly said that the water and mineral waste unleashed by the dam burst were not toxic. On Wednesday, the United Nations human rights agency said “new evidence” showed that the mud dumped by the flood “contained high levels of toxic heavy metals and other chemicals.”
(Adopted from www.nytimes.com)
Fill in the blanks with the option that best completes the text.
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Um pedaço de queijo, em forma de prisma triangular regular, tem 6 cm de altura e possui como base um triângulo de 10 cm de lado. O volume desse pedaço de queijo é ____ !$ \sqrt 3\, cm^3 !$.
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Read the cartoon and answer question.

Taken from http://www.swamp.com.au/archives. Accessed on 26/10/2015
Choose the correct alternative, according to the cartoon.
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