Questões - UFF | Gabarito e resoluções

(UFF - 2002) O circuito trangular de uma corrida est esquematizado na figura a seguir: As ruas TP e SQ so paralelas. Partindo de S, cada corredor deve percorrer o circuito passando, sucessivamente, por R, Q, P, T, retornando, finalmente a S. Assinale a opo que indica o permetro do circuito.

(Uff 2002) A invenção da roda dágua possibilitou a substituição do esforço humano eanimal na realização de diversas atividades. O registro de sua utilização é anterior a 85 a.C. e,nos dias de hoje, ainda pode ser vista como um mecanismo que auxilia o movimento de outros. Na figura a seguir, estão ilustrados os principais elementos de um sistema rudimentar de geração de energia elétrica: a água que jorra do tubo faz a roda girar, acionando um gerador elétrico. Considere um sistema, como o representado acima, com as seguintes características: a vazão é constante; a água sai do tubo com velocidade desprezível, atingindo a roda 4,0 m abaixo; o rendimento é de 75%.Supondo que a potência elétrica oferecida pelo gerador em seus terminais seja 15 kW e desprezando as perdas de líquido, determine o volume de água que jorra do tubo a cada segundo.

(UFF - 2002) TEXTO PARA A PRXIMA QUESTO: Read the text below, from Scientific American (SA), and choose the best option for the questions. INTERVIEW WITH PAUL NURSE* This biologist has followed his interests from fur and feather to cell cycles and cancer control Paul Nurse is one of Britains most distinguished scientists today. 1His groundbreaking work on the cell cycle in the 1970s and 80s revealed how cells make the decisions to grow and divide, thus laying the foundation for a MOLECULAR UNDERSTANDING OF CANCER. 2This has earned him numerous honors, including the LASKER BASIC MEDICAL RESEARCH AWARD in 1998, and many regard him a prime candidate for the NOBEL PRIZE. Since 1996, Sir Paul, who WAS KNIGHTED last year, has also been director-general of the largest cancer research organization in the U.K., the IMPERIAL CANCER RESEARCH FUND (ICRF). (was knighted = foi condecorado como cavaleiro) SA: When did you decide to become a scientist? Was that quite early, or only at university? PN: Well, I think actually already as a schoolchild. I remember seeing Sputnik 2 when I was in London. As a young child, eight or nine years old, I read about it in the newspaper and went out in our garden and saw Sputnik 2 fly over, I think in 1957 or 1958, and this was truly amazing. And then when I was a little older I became interested in natural history, and I watched birds, and I collected beetles, and was interested in plants and so on. So my main entre into biology was through natural history. I think that is quite common. SA: Was it always clear you wanted to become a biologist, not a physicist or an astronomer? PN: Yes, but originally I was more interested in natural history and ecology, and then I found it so difficult, because the laboratory of this field [pointing to the grass] is too uncontrolled. So as I grew older, as an undergraduate and then as a postgraduate, I really wanted to work more on molecular and cellular things, because you could do controlled experiments so much better. SA: Who do you consider your most important teacher? PN: I had a very good teacher of biology at school, who I recently met again actually, a man called Keith Neal. Then I think a very important person was my postdoctoral advisor, when I was in the University of Edinburgh, Professor Murdoch Mitchison, who gave me great freedom as a young investigator and allowed me to work in my own way. I owe him great debt for that. He encouraged me, he spoke to me, but he really made no attempt to control me, a very good situation. SA: You are mostly famous for your work on the CELL CYCLE, the cell machinery that controls cell division in eukaryotes. Could you explain what your most important discovery was? PN: I think the most interesting discovery that I made was to identify components of what is now sometimes called the cell cycle engine. All humans are made up of billions of cells, and they grow and divide. The process that brings about the reproduction of cells is called the cell cycle. I have been interested for many years in what controls progression through that cell cycle, what regulates the cell division process. SA: You have two daughters, is either one planning to be a scientist? PN: I have two daughters, that is true. One of them is, at the moment, a sports journalist at our local television station in Oxford, and the other is in her final year at Manchester University doing theoretical physics. So I have one who is a scientist and one who isnt. SA: Did you ever encourage them to become scientists? PN: No, but I would be quite pleased if one of them did. But I think they should make up their own minds. SA: I also know you are a pilot. Do you think flying an airplane and heading a research institute have anything in common, or is it very different? PN: Its very different, and I think thats why I am attracted to it. I am a glider pilot, mainly, and I fly gliders when I can at the weekend. Its really to do something totally different, having to concentrate on totally different sorts of things, like keeping this airplane up, and going in the right direction, and finding the up currents. Its a major relaxation because it is so different from what I do normally. SA: Do you think you will always work on the cell cycle? PN: I am still working on the cell cycle, but I also have a new area, which is related to the cell cycle, which is cell morphogenesis, or how a cell obtains its form, its shape. I think this is another very fundamental biological problem, like the cell cycle, which I find very interesting. It has some relevance to cancer also, because when cancer cells metastasize and spread through the body, they have to undergo a variety of cell shape changes to be able to escape from their tissue and to get into other places. But the basic mechanisms that control cell shape are simply not understood. SA: Have you had any personal experience with cancer in your family or among friends, and did that change your view of cancer research? PN: Because I am director-general of ICRF, it actually means that I meet now many people that have been affected by cancer. So although in my own family I have not, one of my friends certainly has. He survived, but that was really a tough time, and it was quite an experience for me. It makes me realize that cancer isnt simply an academic problem, that it is a problem that obviously influences in very important ways peoples lives, and I think that changes the way you view the research that goes on in an institute. SA: Do you think we will see a cure for cancer like our grandparents saw a cure for infectious diseases? PN: I dont, actually. Cancer, first of all, is many different diseases, many different sites and forms; some people say it is as many as 200 different diseases. There are many different genes that can become defective to give rise to cancer, and they all have different characteristics. So I think the likelihood of having a common treatment for all of these is just not likely. There will be some treatments that will be useful across the board, but I think it would be a mistake to look for the cure to cancer. But what I think we can expect to see is steady improvement by applying this new knowledge to treating and preventing the disease. *Paul Nurse was awarded the 2001 Nobel Prize for Medicine. Scientific American: Interviews: Paul Nurse: June 26, 2000 False friends are words in a foreign language which are similar in form to words in our mother tongue, but which do not have the same meaning. Which pair of words below (taken from the text) contains ONLY false friends?

(UFF - 2002) Imbudos da moral protestante e movidos pelo sonho de uma nova vida proveniente das transformaes industriais europeias, os pioneiros da marcha para o oeste iniciaram a grande obra de povoamento do territrio norte-americano e de reconhecimento de suas riquezas. Considerando-se o aspecto histrico do alargamento de fronteiras nos Estados Unidos, pode-se dizer que a marcha para o oeste:

(Uff 2002) A utilização da luneta astronômica de Galileu auxiliou a construção de uma nova visão do Universo. Esse instrumento óptico, composto por duas lentes - objetiva e ocular - está representado no esquema a seguir. Considere a observação de um objeto no infinito por meio da luneta astronômica de Galileu. Nesse caso, as imagens do objeto formadas pelas lentes objetiva e ocular são, respectivamente:

(UFF 2002) Na doena miastenia grave, o corpo humano produz anticorpos contra suas prprias molculas de receptores de acetilcolina. Esses anticorpos ligam-se e bloqueiam os receptores de acetilcolina da membrana plasmtica das clulas musculares. medida que a doena progride, a maioria dos msculos enfraquece, e o doente pode apresentar dificuldades para engolir e respirar. Esses anticorpos:

(UFF - 2001) Alguns estudantes de Qumica, avaliando seus conhecimentos relativos e conceitos bsicos para o estudo do tomo, analisam as seguintes afirmativas: I. tomos istopos so aqueles que possuem mesmo nmero atmico e nmeros de massa diferentes. lI. O nmero atmico de um elemento corresponde soma do nmero de prtons com o de nutrons. IlI. O nmero de massa de um tomo, em particular, a soma do nmero de prtons com o de eltrons. IV. tomos isbaros so aqueles que possuem nmeros atmicos diferentes e mesmo nmero de massa. V. tomos istonos so aqueles que apresentam nmeros atmicos diferentes, nmeros de massa diferentes e mesmo nmero de nutrons. Esses estudantes concluem, corretamente, que as afirmativas verdadeiras so as indicadas por:

(UFF - 2001) O iluminismo do sculo XVIII foi responsvel por novas ideias e possibilidades de leitura do mundo e da sociedade. Considere desdobramentos da afirmativa acima e numere a coluna a seguir: (__) O Contrato Social de J. J. Rousseau (__) A Enciclopdia orientada por Diderot e D`Alembert (__) Progresso (__) Liberdade, Igualdade e Fraternidade (1) Obra de relevante importncia dentre as produzidas pelos filsofos das luzes. (2) Empreendimento literrio-cientfico que pretendeu sistematizar todo o conhecimento da poca. (3) Lema central das ideias de oposio ao Antigo Regime, presente na propaganda da Revoluo Francesa. (4) Principal ideia das teorias iluministas acerca do desenvolvimento da histria humana. (5) Sntese do pensamento jacobino na etapa final da Revoluo Francesa. Assinale a opo que apresenta a sequncia correta da numerao.

(UFF - 2001) Um pedao de papel tem a forma do tringulo equiltero PQR, com 7 cm de lado,sendo M o ponto mdio do lado PR: Dobra-se o papel de modo que os pontos Q e M coincidam, conforme ilustrado acima. O permetro do trapzio PSTR, em cm, igual a:

(UFF - 2001) Quando comparada revoluo chinesa, a independncia indiana adquire uma singularidade que, ainda hoje, desperta a ateno dos estudiosos. Ao contrrio de uma revoluo comunista, a ndia adquiriu sua independncia pela via pacfica. Identifique o comentrio que se refere, corretamente, poltica implementada por Gandhi para obter a independncia.

(UFF) Segundo alguns especialistas, o populismo foi um fenmeno poltico mpar na histria recente do Brasil, sendo definido como manipulao das massas populares por lderes carismticos. No entanto, h autores que consideram tal viso pouco elucidativa do fenmeno porque, em verdade:

(UFF -2000) A Revoluo Russa, que iniciou o processo de construo do socialismo na antiga URSS, teve o seu desfecho, em 1917, marcado por dois momentos. O primeiro, em fevereiro, quando os mencheviques organizaram o governo provisrio e o segundo, em outubro, quando os bolcheviques assumiram a conduo da revoluo e a tornaram vitoriosa. A respeito dos mencheviques e bolcheviques, afirma-se: I. Os mencheviques defendiam a construo do socialismo por meio de alianas com os burgueses ligados ao grande capital. II. Os bolcheviques consideravam o capitalismo consolidado na Rssia e pretendiam a mobilizao das massas em direo ao socialismo, sem quaisquer alianas com os setores burgueses. III. Mencheviques e bolcheviques eram denominaes decorrentes da origem geogrfica dos revolucionrios: os mencheviques tinham sua origem social nos ncleos urbanos e os bolcheviques estavam ligados a bases rurais. Com relao a estas afirmativas, conclui-se que:

(Uff 2000) Quando José de Alencar publicou IRACEMA, recebeu uma série de críticas de que se defende, notadamente, em posfácio à segunda edição. Pinheiro Chagas foi um crítico romântico que atacou José de Alencar e os escritores brasileiros da época, como se lê no fragmento que se segue: o defeito que eu vejo em todos os livros brasileiros e contra o qual não cessarei de bradar intrepidamente é a falta de correção na linguagem portuguesa, ou antes a mania de tornar o brasileiro uma língua diferente do velho português por meio de neologismos arrojados e injustificáveis e de insubordinações gramaticais... (CHAGAS, Pinheiro. APUD José de Alencar. Rio de Janeiro: Aguilar, 1964, v.III, p.1129.) Assinale a opção que corresponde à posição de Pinheiro Chagas no fragmento anterior.

(UFF - 2000) Ebola turns out to be yellow fever Gary Younge in Berlin Saturday August 7, 1999 The Ebola virus panic gripping Germany finally subsided yesterday when the man suspected of having contracted the disease was diagnosed as having died of yellow fever, five days after returning from west Africa. Olaf Ullmann, 40, died at 7.24am yesterday - the first person to be killed by yellow fever in Germany for more than 50 years. His health had deteriorated rapidly in the last 24 hours as his liver and kidneys failed and he lost consciousness. Ebola was ruled out late on Thursday night, but there was a delay in diagnosing yellow fever partly because Ullmann had been vaccinated in 1993. The doctor who treated him said yellow fever and Ebola had similar symptoms of heavy breathing and high fever, but little else could have been done to save him. Even had we known from the beginning he was suffering from yellow fever it would not have changed the treatment, said Norbert Suttorp of Berlins Charit hospital. The yellow fever vaccination, considered effective for at least 10 years, fails to provide immunity in 1% of cases. Ullmann was probably bitten by an infectedmosquito during his trip to Ivory Coast, where he was filming a documentary on local wildlife. Experts in tropical medicine wearing plastic suits had been treating him since Tuesday. A 6ft fence was erected around his isolation ward. An outbreak of yellow fever is considered unlikely: his three travelling companions, including his wife, are in good health. Swissair, which flew the Ullmanns back from Ivory Coast, has given the passenger list to the German authorities but the risk of contagion is considered negligible. Even had we known from the beginning he was suffering from yellow fever it would not have changed the treatment ( 5). The verb phrases in bold indicate that the change in treatment:

(Uff 2000) Duas partículas, de massas m1 e m2, colidem frontalmente. A velocidade de cada uma delas, em função do tempo, está representada no gráfico: A relação entre m1 e m2 é: