Questões - UFSCAR 2000 | Gabarito e resoluções

(UFSCar- 2000) Tu amars outras mulheres E tu me esquecers! to cruel, mas a vida. E no entretanto Alguma coisa em ti pertence-me! Em mim alguma coisa s tu. O lado espiritual do nosso amor Nos marcou para sempre. Oh, vem em pensamento nos meus braos! Que eu te afeioe e acaricie... (Manuel Bandeira: A Viglia de Hero. In: O ritmo dissoluto. Poesia completa e prosa. 2 ed. Rio de Janeiro: Jos Aguilar, 1967, p. 224.) Manuel Bandeira usa, no poema, os pronomes pessoais com muitas variaes. O pronome pessoal de primeira pessoa do singular, por exemplo, est empregado na sua forma reta e nas formas oblquas (eu, me, mim). O mesmo acontece com o pronome pessoal de

(Ufscar 2000) Maxwell, notvel fsico escocs da segunda metade do sculo XIX, inconformado com a possibilidade da morte trmica do Universo, consequncia inevitvel da Segunda Lei da Termodinmica, criou o demnio de Maxwell, um ser hipottico capaz de violar essa lei. Essa fictcia criatura poderia selecionar as molculas de um gs que transitassem entre dois compartimentos controlando a abertura que os divide, como ilustra a figura. Por causa dessa manipulao diablica, as molculas mais velozes passariam para um compartimento, enquanto as mais lentas passariam para o outro. Se isso fosse possvel,

(UFSCar -2000) TEXTO PARA A PRXIMA QUESTO: THE END OF EVOLUTION? The development of symbolic thought and complex communication did nothing less than alter human evolution. For one thing, high-tech transportation means that the world, though ethnically diverse, now really consists of a single, huge population. Everything we know about evolution suggests that to get true innovation, you need small, isolated populations, says Tattersall, which is now unthinkable. Not only is a new human species next to impossible, but technology has essentially eliminated natural selection as well. During prehistory, only the fittest individuals and species survived to reproduce. Now strong and weak alike have access to medicine, food and shelter of unprecedented quality and abundance. Poor peasants in the Third World, says University of Michigan anthropologist Milford Wolpoff, are better off than the Emperor of China was 1,000 years ago. And technology shows no signs of slowing down, which means that even dramatic changes in the natural world wont necessarily have evolutionary consequences. Argues Wolpoff.. Were not going to adapt to the next ice age by changing our physical form. Well set off an atom bomb or set up a space mirror or whatever to control climate. Manipulation of the human genome, meanwhile, will eventually let us change the basic characteristics of our species to order. Evolution by natural selection could be replaced, perhaps chillingly, with evolution by human intervention. Thats not to say humanity cant become extinct. A 50-mile-wide asteroid crashing down from space would do it. So could a sudden and thorough collapse of earths ecosystem through pollution, deforestation and the like - unless we establish some colonies in space beforehand. But, whatever happens, the long history of multiple hominid species struggling for supremacy on earth is over. After millions of years, evolution by natural selection, operating blindly and randomly, has produced a creature capable of overturning evolution itself. Where we go from here is now up to us. (From Up From The Apes in TIME MAGAZINE, August 23,1999, p. 5.) A palavra which na frase which is now unthinkable, constante da ltima linha do primeiro pargrafo, refere-se a

(UFSCar - 2000) TEXTO PARA A PRXIMA QUESTO: THE END OF EVOLUTION? The development of symbolic thought and complex communication did nothing less than alter human evolution. For one thing, high-tech transportation means that the world, though ethnically diverse, now really consists of a single, huge population. Everything we know about evolution suggests that to get true innovation, you need small, isolated populations, says Tattersall, which is now unthinkable. Not only is a new human species next to impossible, but technology has essentially eliminated natural selection as well. During prehistory, only the fittest individuals and species survived to reproduce. Now strong and weak alike have access to medicine, food and shelter of unprecedented quality and abundance. Poor peasants in the Third World, says University of Michigan anthropologist Milford Wolpoff, are better off than the Emperor of China was 1,000 years ago. And technology shows no signs of slowing down, which means that even dramatic changes in the natural world wont necessarily have evolutionary consequences. Argues Wolpoff.. Were not going to adapt to the next ice age by changing our physical form. Well set off an atom bomb or set up a space mirror or whatever to control climate. Manipulation of the human genome, meanwhile, will eventually let us change the basic characteristics of our species to order. Evolution by natural selection could be replaced, perhaps chillingly, with evolution by human intervention. Thats not to say humanity cant become extinct. A 50-mile-wide asteroid crashing down from space would do it. So could a sudden and thorough collapse of earths ecosystem through pollution, deforestation and the like - unless we establish some colonies in space beforehand. But, whatever happens, the long history of multiple hominid species struggling for supremacy on earth is over. After millions of years, evolution by natural selection, operating blindly and randomly, has produced a creature capable of overturning evolution itself. Where we go from here is now up to us. (From Up From The Apes in TIME MAGAZINE, August 23,1999, p.5.) A palavra unless que se encontra no ltimo pargrafo, na frase -unless we establish some colonies... indica uma relao de

(UFSCAR - 2000) Sejam m e n dois nmeros reais. A desigualdade m2 + n2 2 mn vale

(UFSCAR - 2000) A condio para que trs nmeros a, b e c estejam, simultaneamente, em progresso aritmtica e em progresso geomtrica que

(UFSCar-2000) Tu amarás outras mulheres E tu me esquecerás! É tão cruel, mas é a vida. E no entretanto Alguma coisa em ti pertence-me! Em mim alguma coisa és tu. O lado espiritual do nosso amor Nos marcou para sempre. Oh, vem em pensamento nos meus braços! Que eu te afeiçoe e acaricie... (Manuel Bandeira: A Vigília de Hero. In: O Ritmo Dissoluto. Poesia Completa e Prosa.2 ed. Rio de Janeiro: José Aguilar, 1967, p. 224.) Manuel Bandeira usa, no poema, os pronomes pessoais com muitas variações. O pronome pessoal de primeira pessoa do singular, por exemplo, está empregado na sua forma reta e nas formas oblíquas (eu, me, mim). O mesmo acontece com o pronome pessoal de

(Ufscar 2000) A câmara municipal de um determinado município tem exatamente 20 vereadores, sendo que 12 deles apóiam o prefeito e os outros são contra. O número de maneiras diferentes de se formar uma comissão contendo exatamente 4 vereadores situacionistas e 3 oposicionistas é.

(UFSCAR 2000) Observe o corte de um embrião, a seguir esquematizado. Os números 1, 2 e 3 representam, respectivamente,  

(UFSCAR - 2000) A condio para que o determinante da matriz A mostrada a seguir seja diferente de zero :

(Ufscar 2000) Nos esquemas estão representadas a velocidade  e a aceleração  do ponto material P. Assinale a alternativa em que o módulo da velocidade desse ponto material permanece constante.

(UFSCAR - 2000) Durante uma aula de laboratrio, um estudante queimou ao ar diferentes massas iniciais (mi) de esponja de ferro. Ao final de cada experimento, determinou tambm a massa final resultante (mf). Os resultados obtidos esto reunidos na tabela a seguir. Experimento N Massa inicial m(i) (g) Massa final m(f) (g) Relao m(f)/m(i) 1 0,900 1,10 1,204 2 0,830 1,00 1,205 3 1,05 1,26 1,200 4 1,11 1,34 1,207 Admitindo que em todos os experimentos a queima foi completa, o estudante fez as trs afirmaes seguintes. I) A Lei da Conservao da Massa no foi obedecida, pois a massa final encontrada para o sistema em cada experimento sempre maior que sua massa inicial. II) O aumento de massa ocorrido em cada experimento se deve transformao de energia em massa, tendo se verificado a conservao da soma (massa + energia) do sistema. III) A relao constante obtida entre a massa final e a massa inicial do sistema (mf/mi), em cada experimento realizado, permite afirmar que, dentro do erro experimental, os dados obtidos esto de acordo com a Lei das Propores Definidas. Dentre as afirmaes apresentadas, o estudante acertou: