Questões - ITA 2002 | Gabarito e resoluções

(ITA - 2002 - 1a Fase) Considere as seguintes espcies no estado gasoso: NF3, BeF2, BCℓ3, CℓF3, KrF4 e SeO42-. Quais delas apresentam momento de dipolo eltrico?

(ITA - 2002 - 1a Fase) Tell me if youve heard this one and hate it by Mike Kennedy For presidents and celebrities as well as ordinary people, cracking jokes can be risky business today, provoking anger and resentment instead of laughter. The problem is that humor, like beauty, often is in the eye of the beholder. Consider a jest by President Clinton. At a trade fair on the White House lawn, Clinton and his cabinet came upon a three-foot-high replica of the White House. With the 4-foot-10 inch secretary of labor, Robert Reich, at his side, Clinton quipped, Secretary Reich could almost live in there. Lighthearted ribbing between longtime pals? Or a remark offensive to those sensitive about their height? Experts who train people to use humor in business and social relationships say it can be an invaluable tool but it must be used with sensitivity. Of course, the line between laughing with someone and laughing at someone isnt always so clear. So in todays litigious and sensitive society should we all take the safest course and avoid any attempts at humor? That would make for a dull world, experts said. The wrong kind of humor, though, can be destructive. Jokes that attack often cause people to withdraw, or worse, seek revenge. Supervisors need to be especially careful. Because of the power they hold, their attempts at humor demean an employee. Of course, some people just cant take a joke. So what can you do? On the politically correct front, there are certain people whose mission is to be offended, Langley said. Theres not really much you can do about them. Fragiadakis, H. Maurer, M. Sound Ideas, 1995 (p.81). Considere as afirmaes abaixo: I. Supervisores correm o risco de humilhar seus funcionrios ao fazerem uma piada, em funo do poder que detm. II. Entre celebridades, as piadas, muitas vezes, provocam ressentimento e raiva ao invs de riso. III. O humor est na mente daqueles que o recebem. est(o) condizente(s) com o texto:

(ITA - 2002- 1a Fase) A massa inercial mede a dificuldade em se alterar o estado de movimento deuma partcula. Analogamente, o momento de inrcia de massa mede a dificuldade em sealterar o estado de rotao de um corpo rgido. No caso de uma esfera, o momento de inrciaem torno de um eixo que passa pelo seu centro dado por , em que M a massada esfera e R seu raio. Para uma esfera de massa M = 25,0kg e raio R = 15,0cm, a alternativa que melhor representa o seu momento de inrcia

(ITA - 2002 - 1a Fase) Considere as seguintes afirmaes sobre nmeros reais positivos: Se e , ento . Se ou , ento . Se e , ento . Ento, destas (so) verdadeira(s)

(ITA - 2002 - 1a Fase) Tell me if youve heard this one and hate it by Mike Kennedy For presidents and celebrities as well as ordinary people, cracking jokes can be risky business today, provoking anger and resentment instead of laughter. The problem is that humor, like beauty, often is in the eye of the beholder. Consider a jest by President Clinton. At a trade fair on the White House lawn, Clinton and his cabinet came upon a three-foot-high replica of the White House. With the 4-foot-10 inch secretary of labor, Robert Reich, at his side, Clinton quipped, Secretary Reich could almost live in there. Lighthearted ribbing between longtime pals? Or a remark offensive to those sensitive about their height? Experts who train people to use humor in business and social relationships say it can be an invaluable tool but it must be used with sensitivity. Of course, the line between laughing with someone and laughing at someone isnt always so clear. So in todays litigious and sensitive society should we all take the safest course and avoid any attempts at humor? That would make for a dull world, experts said. The wrong kind of humor, though, can be destructive. Jokes that attack often cause people to withdraw, or worse, seek revenge. Supervisors need to be especially careful. Because of the power they hold, their attempts at humor demean an employee. Of course, some people just cant take a joke. So what can you do? On the politically correct front, there are certain people whose mission is to be offended, Langley said. Theres not really much you can do about them. Fragiadakis, H. Maurer, M. Sound Ideas, 1995 (p.81). Considere as afirmaes abaixo: I. Devemos evitar o humor na sociedade atual. II. Pessoas expostas ao tipo inadequado de humor podem procurar se vingar. III. O autor afirma que Clinton no poderia ter brincado levianamente com o velho amigo. est(o) condizente(s) com o texto:

(ITA - 2002 - 1a Fase) Em um experimento verificou-se a proporcionalidade existente entre energia e a frequncia de emisso de uma radiao caracterstica. Neste caso, a constante de proporcionalidade, em termos dimensionais, equivalente a

(ITA - 2002 - 1a Fase) Sejam a, b, c reais no-nulos e distintos, c 0. Sendo par a funo dada por,ento f(x), para -c x c, constante e igual a

(ITA - 2002 - 1a Fase) A adio de glicose slida ( ) a clorato de potssio () fundido, a 400oC , resulta em uma reao que forma dois produtos gasosos e um slido cristalino. Quando os produtos gasosos formados nessa reao, e resfriados temperatura ambiente, so borbulhados em uma soluo aquosa 0,1 mol/L em hidrxido de sdio, contendo algumas gotas de fenolftalena, verifica-se a mudana de cor desta soluo de rosa para incolor. O produto slido cristalino apresenta alta condutividade eltrica, tanto no estado lquido como em soluo aquosa. Assinale a opo CORRETA que apresenta os produtos formados na reao entre glicose e clorato de potssio:

(ITA - 2002 - 1a Fase) Considere as seguintes configuraes eletrnicas de espcies no estado gasoso: I. 1s22s22p1 II. 1s22s22p3. III. 1s22s22p4. IV. 1s22s22p5. V. 1s22s22p53s1. Assinale a alternativa ERRADA.

(ITA - 2002 - 1a Fase) Tell me if youve heard this one and hate it by Mike Kennedy For presidents and celebrities as well as ordinary people, cracking jokes can be risky business today, provoking anger and resentment instead of laughter. The problem is that humor, like beauty, often is in the eye of the beholder. Consider a jest by President Clinton. At a trade fair on the White House lawn, Clinton and his cabinet came upon a three-foot-high replica of the White House. With the 4-foot-10 inch secretary of labor, Robert Reich, at his side, Clinton quipped, Secretary Reich could almost live in there. Lighthearted ribbing between longtime pals? Or a remark offensive to those sensitive about their height? Experts who train people to use humor in business and social relationships say it can be an invaluable tool but it must be used with sensitivity. Of course, the line between laughing with someone and laughing at someone isnt always so clear. So in todays litigious and sensitive society should we all take the safest course and avoid any attempts at humor? That would make for a dull world, experts said. The wrong kind of humor, though, can be destructive. Jokes that attack often cause people to withdraw, or worse, seek revenge. Supervisors need to be especially careful. Because of the power they hold, their attempts at humor demean an employee. Of course, some people just cant take a joke. So what can you do? On the politically correct front, there are certain people whose mission is to be offended, Langley said. Theres not really much you can do about them. Fragiadakis, H. Maurer, M. Sound Ideas, 1995 (p.81). Considere a frase abaixo, extrada do texto: Of course, the line between 1laughing withsomeone and 2laughing at someone isnt always so clear. (7 pargrafo). As expresses em destaque so, respectivamente, sinnimas de:

(ITA - 2002 - 1a Fase) Uma rampa rolante pesa 120 N e se encontra inicialmente em repouso, comomostra a figura. Um bloco que pesa 80 N, tambm em repouso, abandonado no ponto 1, deslizando a seguirsobre a rampa. O centro de massa G da rampa tem coordenadas: x = 2b/3 e y = c/3. Sodados ainda: a = 15,0 m, sen = 0,6. Desprezando os possveis atritos e as dimenses dobloco, pode-se afirmar que a distncia percorrida pela rampa no solo, at o instante em que obloco atinge o ponto 2,

(ITA - 2002 - 1a Fase) Os valores de x para os quais a funo real dada por est definida, formam o conjunto

(ITA - 2002 - 1a Fase) Considere as seguintes afirmaes relativas aos sistemas descritos a seguir,sob presso de 1atm: I. A presso de vapor de uma soluo aquosa de glicose 0,1 mol/L menor do que a pressode vapor de uma soluo de cloreto de sdio 0,1 mol/L a 25C. II. A presso de vapor do n-pentano maior do que a presso de vapor do n-hexano a 25C. III. A presso de vapor de substncias puras como: acetona, ter etlico, etanol e gua, todasem ebulio, tem o mesmo valor. IV. Quanto maior for a temperatura, maior ser a presso de vapor de uma substncia. V. Quanto maior for o volume de um lquido, maior ser a sua presso de vapor. Destas afirmaes, esto CORRETAS

(ITA - 2002 - 1a Fase) Um sistema composto por duas massas idnticas ligadas por uma mola de constante k, e repousa sobre uma superfcie plana, lisa e horizontal. Uma das massas ento aproximada da outra, comprimindo 2,0 cm da mola. Uma vez liberado, o sistema inicia um movimento com o seu centro de massa deslocando com velocidade de 18,0 cm/s numa determinada direo. O perodo de oscilao de cada massa

(ITA - 2002- 1a Fase) Seja a equao em . Qual dentre as alternativas a seguir igual soma de duas das razes dessa equao?