Questões - AFA | Gabarito e resoluções

(AFA - 2008) A figura mostra um objeto A, colocado a 8 m de um espelho plano, e um observador O, colocado a 4 m desse mesmo espelho. Um raio de luz que parte de A e atinge o observador Opor reflexo no espelho percorrer, nesse trajeto de A para O

(AFA - 2008) Lucy Van Pelt works hard at being bossy, crabby andselfish. She is loud and yells a lot. Her smiles and motives are rarely pure. Shes a know-it-all who dispenses advice whether you want it or not and for Charlie Brown, theres a charge. (...) The absence of logic in her arguments holds a kind of shining lunacy. When it comes to compliments, Lucy only likes receiving them. If shes paying one or even smiling shes probably up to something devious. Choose the alternative that has the best sequence of antonyms to the boldfaced words from the text respectively.

(AFA - 2008) Um espelho esfrico E de distncia focal f e uma lente convergente L esto dispostos coaxialmente, com seus eixos pticos coincidentes. Uma fonte pontual de grande potncia, capaz de emitir luz exclusivamente para direita, e colocada em P. Os raios luminosos do ponto acendem um palito de fsforo com a cabea em Q, conforme mostra a figura. Considerando-se as medidas do esquema, pode-se afirmar que a distncia focal da lente vale

(AFA - 2008) Considere uma pelcula transparente de faces paralelas com ndice de refrao n iluminada por luz monocromtica de comprimento de onda no ar igual a , como mostra a figura abaixo. Sendo a incidncia de luz pouco inclinada, a mnima espessura de pelcula para que um observador a veja brilhante por luz refletida

(AFA - 2008) Read the following headlines and answer questions 22 and 23. 1. Many simple actions have wider impacts than we realize. 2. Minimizing paper waste is an easy way to start. 3. Use energy-efficient appliances, fewer harsh chemicals. 4. Keep water sources clean; make good use of local farms. www.nationalgeographic.com Mark the alternative which has a sentence with a DIFFERENT meaning from the headlines 1 to 4, respectively.

(AFA - 2008) Um projtil de massa m e velocidade v atinge horizontalmente um bloco de massa M que se encontra acoplado a uma mola de constante elstica K, como mostra a figura abaixo. Apos o impacto, o projtil se aloja no bloco e o sistema massa-mola-projtil passa a oscilar em MHS com amplitude a. No hatrito entre o bloco e o plano horizontal nem resistncia do ar. Nessas condies, a posio em funo do tempo para o oscilador harmnico simples dada pela expressox = acos(t+ 0), onde a e valem, respectivamente,

(AFA - 2008) Read the following headlines and answer questions 22 and 23. 1. Many simple actions have wider impacts than we realize. 2. Minimizing paper waste is an easy way to start. 3. Use energy-efficient appliances, fewer harsh chemicals. 4. Keep water sources clean; make good use of local farms. www.nationalgeographic.com Mark the alternative that has the best title to the group of sentences above.

(AFA - 2008) Considere um sistema formado por duas cordas diferentes, com densidades 1 e 2 tal que 1 2, em que se propagam dois pulsos idnticos, conforme mostra a figura abaixo. A opo que melhor representa a configurao resultante no sistema aps os pulsos passarem pela juno das cordas

(AFA - 2008) Read the text bellow and answer questions 24 and 25 according to it. Child Labor An estimated 246 million children are engaged in child labor worldwide. Of those, approximately three-quarters (171 million) work in hazardous situations or conditions, such as working with pesticides in agriculture or working with dangerous machinery. They are everywhere but they are invisible, working in homes, shops and plantations. Millions of girls who work as unpaid domestic servants are vulnerable to exploitation and abuse. Millions of others work under horrific circumstances: they are trafficked (12 million), forced into several forms of slavery (57 million), into prostitution and pornography(18 million), into participating in armed conflict (0,3 million) or other illicit activities (0,6 million). However, the vast majority of child laborers 70 per cent or more work in agriculture. The Brazilian Household Survey ( Pesquisa Nacional por Amostra de Domiclios PNAD) which was published in October 2002 confirmed that 2.9 million children between the ages of 5 and 15 still worked in Brazil. In 1992 there were about 8 million laboring children and in 1995 that number dropped to about 4.5 million. Challenge, Richmond Publishing Child labor in agriculture is considered hazardous because (of)

(AFA - 2008) Um corpo B, de massa igual a 4 kg e carga eltrica +6 C, dista 30 mm do corpo A, fixo e com carga eltrica -1 C. O corpo B suspenso por um fio isolante, de massa desprezvel ligado a uma mola presa ao solo, como mostra a figura. O comprimento natural da mola L0 = 1,2 m e ao sustentar estaticamente o corpo B ela se distende, atingindo o comprimento L = 1,6 m. Considerando-se a constante eletrosttica do meio k = 9.109 N.m2/C2, que as cargas originais dos corpos pontuais A e B so mantidas e desprezando-se os possiveis atritos, o valor da constante elstica da mola, em N/m,

(AFA - 2008) Read the text bellow and answer questions 24 and 25 according to it. Child Labor An estimated 246 million children are engaged in child labor worldwide. Of those, approximately three-quarters (171 million) work in hazardous situations or conditions, such as working with pesticides in agriculture or working with dangerous machinery. They are everywhere but they are invisible, working in homes, shops and plantations. Millions of girls who work as unpaid domestic servants are vulnerable to exploitation and abuse. Millions of others work under horrific circumstances: they are trafficked (12 million), forced into several forms of slavery (57 million), into prostitution and pornography(18 million), into participating in armed conflict (0,3 million) or other illicit activities (0,6 million). However, the vast majority of child laborers 70 per cent or more work in agriculture. The Brazilian Household Survey ( Pesquisa Nacional por Amostra de Domiclios PNAD) which was published in October 2002 confirmed that 2.9 million children between the ages of 5 and 15 still worked in Brazil. In 1992 there were about 8 million laboring children and in 1995 that number dropped to about 4.5 million. Challenge, Richmond Publishing The sentence, They are everywhere but are invisible, means that these children in fact

(AFA - 2008) Culture Shock Adjusting to a new culture and way of life is both exciting and challenging you will experience some highs and lows during your time abroad. During these times of difficulty, just remind yourself that these cultural differences are the reason we all love to travel to experience the unknown! Remember its just a phase! As you adjust to the routine of daily life, that initial sense of adventure will wear off. During this phase you may start to miss your friends and families. During this time, you may find it hard to keep a positive attitude. You may be tempted to withdraw from people around you or even become hostile. At this point it is helpful to know that for most people this phase doesnt last too long. Challenge, Richmond Publishing One of the statements from the text shows different moments lived by people who are abroad. Mark it, according to the text.

(AFA - 2008) Aqueceu-se certa quantidade de um lquido utilizando um gerador de f.e.m. = 50 V e resistncia interna r = 3 e um resistor de resistncia R. Se a quantidade de calor fornecida pelo resistor ao lquido foi de 2.105 J, pode-se afirmar que otempo de aquecimento foi

(AFA - 2008) No circuito representado abaixo, os geradores G1 e G2 so ideais e os resistores tem a mesma resistencia R. Se a potncia dissipada por R2nula, ento a razo entre as f.e.m. de G1 e G2

(AFA - 2008) Culture Shock Adjusting to a new culture and way of life is both exciting and challenging you will experience some highs and lows during your time abroad. During these times of difficulty, just remind yourself that these cultural differences are the reason we all love to travel to experience the unknown! Remember its just a phase! As you adjust to the routine of daily life, that initial sense of adventure will wear off. During this phase you may start to miss your friends and families. During this time, you may find it hard to keep a positive attitude. You may be tempted to withdraw from people around you or even become hostile. At this point it is helpful to know that for most people this phase doesnt last too long. Challenge, Richmond Publishing De acordo com o texto, correto afirmar que