Questões - AFA 2009 | Gabarito e resoluções

(AFA - 2009) Warning: Flying is bad for your health Flying is the safest way to travel - or is it? Some doctors think the airplane is a dangerous place, especially for the old or the unhealthy. Although the airplane is pressurized, there is less oxygen than on the ground. So anyone who has had a heart attack should not try for at least two weeks after the attack. After an operation, you should stay on the ground for at least ten days. Sitting on a plane for many hours especially in economy class where there isnt very much leg room gives everyone [10] aches and pain, so you should get some exercise, especially on long flights. Flying also causes dehydration. If you drink or eat too much, youll wake up feeling sick. Everyone needs to drink more in the air, but you shouldnt drink alcohol because it makes you even more thirsty. The most common problem is jet lag. You should change to your new time zone as soon as possible, and you shouldnt sleep if its still daylight. Crowded airports, long lines, and delays cause stress and high blood pressure. So, be careful! Flying is the safest way totravel, but is it the healthiest? (Move Up, Heinemann) Aches and pain (line 10)

(AFA - 2009) A figura I representa uma lente delgada convergente com uma de suas faces escurecida por tinta opaca, de forma que a luz s passa pela letra F impressa. Um objeto, considerado muito distante da lente, disposto ao longo do eixo ptico dessa lente, como mostra a figura II. Nessas condies, a imagem fornecida pela lente e projetada no anteparo poder ser

(AFA - 2009) Warning: Flying is bad for your health Flying is the safest way to travel - or is it? Some doctors think the airplane is a dangerous place, especially for the old or the unhealthy. Although the airplane is pressurized, there is less oxygen than on the ground. So anyone who has had a heart attack should not try for at least two weeks after the attack. After an operation, you should stay on the ground for at least ten days. Sitting on a plane for many hours especially in economy class where there isnt very much leg room gives everyone aches and pain, so you should get some exercise, especially on long flights. Flying also causes dehydration. If you drink or eat too much, youll wake up feeling sick. Everyone needs to drink more in the air, but you shouldnt drink alcohol because it makes you even more thirsty. The most common problem is jet lag. You should change to your new time zone as soon as possible, and you shouldnt sleep if its still daylight. Crowded airports, long lines, and delays cause stress and high blood pressure. So, be careful! Flying is the safest way totravel, but is it the healthiest? (Move Up, Heinemann) From the text its also possible to get

(AFA - 2009) A imagem de um ponto P, posicionado a uma distncia d de um espelho plano E, pode ser visualizada por dois observadores A e B, como mostra a figura abaixo. A respeito da imagem P do ponto P vista pelos observadores, correto afirmar que

(AFA - 2009) Americans are well-known for being friendly. If were [2] taking a walk in the park and we pass someone, we usually [3] say a few words to people in stores, bars and banks. But remember: friendliness is not friendship; its politeness. In the United States, its just as hard to make real friends as it is anywhere else. (Move Up - Heinemann ) In the statement, we usually say a few words to people in stores (lines 2 and 3) the underlined words may be understood as

(AFA - 2009) Considere dois pssaros A e B em repouso sobre um fio homogneo de densidade linear , que se encontra tensionado, como mostra a figura abaixo. Suponha que a extremidade do fio que no aparece esteja muito distante da situao apresentada. Subitamente o pssaro A faz um movimento para alar vo, emitindo um pulso que percorre o fio e atinge o pssaro B t segundos depois. Despreze os efeitos que o peso dos pssaros possa exercer sobre o fio. O valor da fora tensora para que o pulso retorne posio onde se encontrava o pssaro A, em um tempo igual a 3t,

(AFA - 2009) Um par de blocos A e B, de massas mA= 2 kg e mB= 10 kg, apoiados em um plano sem atrito, acoplado a duas molas ideais de mesma constante elstica K = 50 N/m, como mostra a figura abaixo. Afastando-se horizontalmente o par de blocos de sua posio de equilbrio, o sistema passa a oscilar em movimento harmnico simples com energia mecnica igual a 50 J. Considerando g = 10 m/s2, o mnimo coeficiente de atrito esttico que deve existir entre os dois blocos para que o bloco A no escorregue sobre o bloco B

(AFA - 2009) Americans are well-known for being friendly. If weretaking a walk in the park and we pass someone, we usually say a few words to people in stores, bars and banks. But remember: friendliness is not friendship; its [5] politeness. In the United States, its just as hard to make real [6] friends as it is anywhere else. ( Move Up - Heinemann ) The sentence, In the United States its just hard to make real friends as it is anywhere else (lines 5 and 6), means

(AFA - 2009) Os valores do potencial eltrico V em cada vrtice de um quadrado esto indicados na figura abaixo. VA= 0 VB= VD= 5V VC= 10 V Os valores desses potenciais condizem com o fato de o quadrado estar situado num campo eletrosttico

QUESTO ANULADA!! (AFA - 2009) Read the following opinions from two children, Chelsea and Eryn (both aged 8) and then answer questions 20 and 21 related to them. Is there future for us? Chelsea: The biggest problem with the environment is the ozone layer theres a hole, and its getting bigger. Its made by cars and airplanes things which give off fumes. Eryn: The ozone layers like a piece of paper covering a rock. Its supposed to protect us. Im scared the hole will get bigger and move around the world and people will get cancer. Chelsea: We could get tandems, and longer bikes, so children could ride on the back. Cars should be very, very expensive. Eryn: You also get bad pollution from burning down the rainforest. We should give money to poor people in Africa and places. Chelsea: We should spread out the people evenly. We could say, Put your hands up all those who want to live in Africa. And then wecould spread out the food. Theres enough to go around. Eryn: We use up far more of the earth than people in Africa so its a good idea for the whole world to discuss the environment. (Move up Heinemann) Both Chelsea and Eryn think that we should a)not to burn a lot of fuel. b)let poor people spread out the food. c)burn down rain forests. d) clean rivers and farmlands. QUESTO ANULADA!!

(AFA - 2009) Na figura abaixo, uma partcula com carga eltrica positiva q e massa m lanada obliquamente de uma superfcie plana, com velocidade inicial de mdulo v0, no vcuo, inclinada de um ngulo em relao horizontal. Considere que, alm do campo gravitacional de intensidade g, atua tambm um campo eltrico uniforme de mdulo E. Pode-se afirmar que a partcula voltar altura inicial de lanamento aps percorrer, horizontalmente, uma distncia igual a

(AFA - 2009) Read the following opinions from two children, Chelsea and Eryn (both aged 8) and then answer questions 20 and 21 related to them. Is there future for us? Chelsea: The biggest problem with the environment is the ozone layer theres a hole, and its getting bigger. Its made by cars and airplanes things which give off fumes. Eryn: The ozone layers like a piece of paper covering a rock. Its supposed to protect us. Im scared the hole will get bigger and move around the world and people will get cancer. Chelsea: We could get tandems, and longer bikes, so children could ride on the back. Cars should be very, very expensive. Eryn: You also get bad pollution from burning down the rainforest. We should give money to poor people in Africa and places. Chelsea: We should spread out the people evenly. We could say, Put your hands up all those who want to live in Africa. And then wecould spread out the food. Theres enough to go around. Eryn: We use up far more of the earth than people in Africa so its a good idea for the whole world to discuss the environment. (Move up Heinemann) Chelsea and Eryn want to show us that in the future

(AFA - 2009) The Reluctant Learner My friend Tom is one of those six-to-midnight, enthusiastic, determined, and well-mentioned studiers. At six oclock he approaches his desk, and carefully organizes everything in preparation for the study period to follow. Having everything in place, he next carefully adjusts each item again, giving him [6] time to think up the first excuse; he recalls that in the [7] morning he did not have quite enough time to read all the [8] items of interest in the newspaper. He also realizes distractions completely out of the way before setting down to the task at hand. (Skyline 5 Macmillan) The sentence, ... he recalls that in the morning he did not have quite enough time to read all the items of interest in the newspaper (lines 6, 7 and 8) shows us how Tom

(AFA - 2009) O elemento de aquecimento de uma torneira eltrica constitudo de dois resistores e de uma chave C, conforme ilustra a figura abaixo. Com a chave C aberta, a temperatura da gua na sada da torneira aumenta em 10 C. Mantendo-se a mesma vazo dgua e fechando C, pode-se afirmar que a elevao de temperatura da gua, em graus Celsius, ser de

(AFA - 2009) Parte de um circuito eltrico constituda por seis resistores hmicos cujas resistncias eltricas esto indicadas ao lado de cada resistor, na figura abaixo. Se a d.d.p. entre os pontos A e B igual a U, pode-se afirmar que a potncia dissipada pelo resistor R3 igual a