Questões - IME | Gabarito e resoluções

(IME - 2007/2008) Considere o polmero bio-absorvvel obtido pela reao de polimerizao do monmero a seguir: Prepara-se uma soluo diluda com 30,60 g deste polmero em 2000 g de tetrahidrofurano (THF). O grfico abaixo apresenta os diagramas de fase (slido-lquido-vapor) desta soluo diluda e de THF puro. A partir dessas informaes, determine: a) o efeito coligativo numericamente evidenciado pelo grfico; b) a funo orgnica formada na reao de polimerizao; c) a frmula estrutural plana do mero (unidade repetitiva do polmero); d) a massa molar mdia deste polmero na soluo especificada; e e) quantos gramas de gua sero gerados na produo de 1 mol do polmero.

(IME - 2007/2008) Cinco equipes concorrem numa competio automobilstica, em que cada equipe possui dois carros. Para a largada so formadas duas colunas de carros lado a lado, de tal forma que cada carro da coluna da direita tenha ao seu lado, na coluna da esquerda, um carro de outra equipe. Determine o nmero de formaes possveis para a largada.

(IME - 2007) Texto II Mancha de Dend no sai Bota pra quarar, Dona Marlia. Bota pra quarar.... Saem o sol e a lua Sai mame e sai papai Bloco vai pra rua Mancha de Dend no sai Como , maninha, Como , cai ou no cai? Voc sai da linha Mancha de Dend no sai. H uma pobre mancha Voc olha e ningum v Coitadinha, uma mancha De azeite-de-dend. Corao na sua Deixe a enquanto viver Mancha continua, S no desmancha prazer. Moraes Moreira - 1984 H uma pobre mancha Voc olha e ningum v Coitadinha, uma mancha De azeite-de-dend. Fora da ideia de tamanho, as formas aumentativas e diminutivas podem traduzir desprezo, crtica, pouco caso, dentre outras caractersticas. Indique a opo em que o substantivo flexionado quanto ao seu grau, transmite-nos a mesma ideia da palavra Coitadinha, encontrada no texto de Moraes Moreira.

(IME - 2007)A figura abaixo mostra uma caixa dgua vazia, com peso de 125 kgf, sustentada por um cabo inextensvel e de massa desprezvel, fixado nos pontos A e D. A partir de um certo instante, a caixa dgua comea a ser enchida com uma vazo constante de . 500 A roldana em L/h B possui atrito desprezvel. Sabendo que o cabo possui seo transversal circular com 1 cm de dimetro e que admite fora de trao por unidade de rea de no mximo 750 , kgf / cm2 determine o tempo de entrada de gua na caixa, em minutos, at que o cabo se rompa. Dado: peso especfico da gua 1000 kgf/m; 3,14

(IME - 2007/2008 - 2 FASE) LEIA O TEXTO A SEGUIR E RESPONDA S QUESTES 4, 5, 6 e 7. Wi-Fi? Why Worry?(Adapted from BBC, April 2007) Scare stories about the dangers of wireless networks lack credibility, argues Bill Thompson 1 Students at Canadas Lakehead University have to be careful how they connect to the internet because Wi-Fi is banned on large parts of the campus. 2 University president Fred Gilbert, whose academic interests include wildlife management, environmental studies and natural resources science, is worried about the health impact of the 2.4 GHz radio waves used by wireless networks. 3 Last year he decided to adopt the precautionary principle and refused to allow Wi-Fi in those areas that have what he calls hard wire connectivity until it is proved to be safe. 4 Mr Gilbert believes that microwave radiation in the frequency range of Wi-Fi has been shown to increase permeability of the blood-brain barrier, cause behavioural changes, alter cognitive functions, activate a stress response, interfere with brain waves, cell growth, cell communication, calcium ion balance, etc., and cause single and double strand DNA breaks. 5 Unfortunately the science says he is wrong, and his students are suffering as a result. Smog talk 6 While the heating effects of high exposures to electromagnetic radiation can be damaging, the power levels of wireless connections are much lower than the microwave ovens and mobile phones which share the frequency range, and treating them in the same way is the worst sort of scaremongering. 7 Yet Mr Gilbert is not alone. 8 In 2003 parents sued a primary school in Chicago because it had dared to provide children with easy access to computing resources over a wireless network. 9 And there are a number of pressure groups, campaigning organisations and ill-informed individuals who believe that wireless networks pose a threat to health and want to see them closed down. 10 Now it seems they have been joined by the editor of the UK newspaper the Independent on Sunday, which this weekend filled its front page with a call for research into the electronic smog that is permeating the nations schools and damaging growing childrens brains. 11 An accompanying editorial with the even-handed headline high-tech horrors called for an official inquiry, while the article outlining the perceived dangers asked Is the Wi-Fi revolution a health time bomb? 12 The answer, of course, is no. 13 That will not stop the newspaper stoking up a wave of opposition to one of the most liberating technologies to have come out of the hi-tech revolution, limiting childrens access to networked computers at schools and even blocking plans to develop municipal wireless networks in our towns and cities. 14 If the journalists were really concerned about the dangers of radio frequency electromagnetic radiation on the sensitive brains of the young, they should be calling for the closure of TV and radio transmission towers rather than asking us to turn off our Wi-Fi laptops. 15 The modulated frequencies that carry Radio 4 and ITV into our homes are just as powerful as the wireless networks, and a lot more pervasive. 16 And my wireless network is only carrying data when Im online, while Radio 3 burbles all day long, possibly exciting electrons in my brain and causing headaches. 17 Then there is the danger from photons of visible light streaming down onto us as we work, since these carry more energy than microwaves and could surely do more damage. 18 Perhaps we should demand that our children work in the dark. Retire do pargrafo indicado uma palavra ou expresso que seja o sinnimo da expresso dada em cada item. 5.1. pargrafo 6 to have something in common : _____________________ 5.2. pargrafo 9 are risky: _____________________ 5.3. pargrafo 10 request: _____________________ 5.4. pargrafo 14 instead of: _____________________ 5.5. pargrafo 17 harm: _____________________

(IME - 2007/2008)Assinale a opo correspondente ao valor da soma das razes da equao:

(IME - 2007/2008) Calcule o pH de uma soluo aquosa 0,5 molar de NH4CN. As constantes de ionizao so KHCN = 7,0 x 10-10 e KNH3 = 1,75 x 10-5. O produto inico da gua Kw = 1,0 x 10-14. Considere que, no equilbrio, as concentraes dos ons [NH4 + ] e [CN- ] so iguais.

(IME - 2007)Em certa experincia, ilustrada na figura abaixo, uma fina barra de lato, de comprimento m, L = 8 inicialmente temperatura de 20 C, encontra-se fixada pelo ponto mdio a um suporte preso superfcie e pelas extremidades a dois cubos idnticos A e B, feitos de material isolante trmico e eltrico. A face esquerda do cubo A est coberta por uma fina placa metlica quadrada P1 , distante d0 = 5 cm de uma placa idntica P2 fixa, formando um capacitor de F, 12 carregado com C. 9 Na face direita do cubo B est fixado um espelho cncavo distante 11 cm de um objeto O, cuja imagem I est invertida. Aquece-se a barra at a temperatura T em Co , quando ento a distncia entre O e I se torna igual a 24 cm e a imagem I, ainda invertida, fica com quatro vezes o tamanho do objeto O. Considerando a superfcie sob os cubos sem atrito, determine: a) a distncia focal do espelho; b) a tenso eltrica entre as placas ao ser atingida a temperatura T ; c) a temperatura T . Dados: coeficiente de dilatao linear do lato

(IME - 2007) Texto II Mancha de Dend no sai Bota pra quarar, Dona Marlia. Bota pra quarar.... Saem o sol e a lua Sai mame e sai papai Bloco vai pra rua Mancha de Dend no sai Como , maninha, Como , cai ou no cai? Voc sai da linha Mancha de Dend no sai. H uma pobre mancha Voc olha e ningum v Coitadinha, uma mancha De azeite-de-dend. Corao na sua Deixe a enquanto viver Mancha continua, S no desmancha prazer. Moraes Moreira - 1984 Corao na sua Deixe a enquanto viver Mancha continua, S no desmancha prazer. Mancha continua, S no desmancha prazer. Observe as palavras mancha e desmancha e indique a opo em que a explicao destes vocbulos encontra-se de acordo com o texto de Moraes Moreira.

(IME - 2007/2008)Determine a expresso da soma a seguir, onde n um inteiro mltiplo de 4.

(IME - 2007/2008)A um reator isotrmico com capacidade de 100 L so adicionados 10 mols do gs X e 15 mols do gs Y, ocorrendo formao do gs Z segundo a reao elementar A tabela abaixo apresenta dados cinticos da reao, onde representa a diferena entre as velocidades das reaes direta e inversa. Determine a concentrao mxima de Z que pode ser obtida.

(IME 2007) LEIA O TEXTO A SEGUIR E RESPONDA S QUESTES 4, 5, 6 e 7. Wi-Fi? Why Worry?(Adapted from BBC, April 2007) Scare stories about the dangers of wireless networks lack credibility, argues Bill Thompson 1 Students at Canadas Lakehead University have to be careful how they connect to the internet because Wi-Fi is banned on large parts of the campus. 2 University president Fred Gilbert, whose academic interests include wildlife management, environmental studies and natural resources science, is worried about the health impact of the 2.4 GHz radio waves used by wireless networks. 3 Last year he decided to adopt the precautionary principle and refused to allow Wi-Fi in those areas that have what he calls hard wire connectivity until it is proved to be safe. 4 Mr Gilbert believes that microwave radiation in the frequency range of Wi-Fi has been shown to increase permeability of the blood-brain barrier, cause behavioural changes, alter cognitive functions, activate a stress response, interfere with brain waves, cell growth, cell communication, calcium ion balance, etc., and cause single and double strand DNA breaks. 5 Unfortunately the science says he is wrong, and his students are suffering as a result. Smog talk 6 While the heating effects of high exposures to electromagnetic radiation can be damaging, the power levels of wireless connections are much lower than the microwave ovens and mobile phones which share the frequency range, and treating them in the same way is the worst sort of scaremongering. 7 Yet Mr Gilbert is not alone. 8 In 2003 parents sued a primary school in Chicago because it had dared to provide children with easy access to computing resources over a wireless network. 9 And there are a number of pressure groups, campaigning organisations and ill-informed individuals who believe that wireless networks pose a threat to health and want to see them closed down. 10 Now it seems they have been joined by the editor of the UK newspaper the Independent on Sunday, which this weekend filled its front page with a call for research into the electronic smog that is permeating the nations schools and damaging growing childrens brains. 11 An accompanying editorial with the even-handed headline high-tech horrors called for an official inquiry, while the article outlining the perceived dangers asked Is the Wi-Fi revolution a health time bomb? 12 The answer, of course, is no. 13 That will not stop the newspaper stoking up a wave of opposition to one of the most liberating technologies to have come out of the hi-tech revolution, limiting childrens access to networked computers at schools and even blocking plans to develop municipal wireless networks in our towns and cities. 14 If the journalists were really concerned about the dangers of radio frequency electromagnetic radiation on the sensitive brains of the young, they should be calling for the closure of TV and radio transmission towers rather than asking us to turn off our Wi-Fi laptops. 15 The modulated frequencies that carry Radio 4 and ITV into our homes are just as powerful as the wireless networks, and a lot more pervasive. 16 And my wireless network is only carrying data when Im online, while Radio 3 burbles all day long, possibly exciting electrons in my brain and causing headaches. 17 Then there is the danger from photons of visible light streaming down onto us as we work, since these carry more energy than microwaves and could surely do more damage. 18 Perhaps we should demand that our children work in the dark. Complete as frases a seguir usando as palavras e expresses do quadro conforme o contedo do texto Wi-Fi? Why Worry? Bill Thompson Fred Gilbert Students at CanadasLakehead University Ill-informed individuals The editor of The Independent Journalists ____________6.1____________ thinks it is a mistake to forbid people to Wi-Fi connect to the internet under the argument of health impact of the 2.4 GHz radio waves used by this kind of technology. ____________6.2____________ devotes attention to diverse issues concerning how to live in nowadays world without the pervasive effects of technology. ____________6.3____________ are not allowed to use Wi-Fi resources in areas where the wire connectivity is available. ____________6.4____________, ____________6.5____________, ____________6.6____________, and ____________6.7____________ agree when it comes to believing that wireless network technology threatens peoples health. ____________6.8____________ were imposed a precautionary principle by ____________6.9____________, and are experiencing an unpleasant situation. ____________6.10____________ are not really worried about the effects Wi-Fi technology can cause in humans bodies, if so they would also claim against radio frequencies and electromagnetic radiation.

(IME - 2007/2008)Uma srie de Fibonacci uma seqncia de valores definida da seguinte maneira: - Os dois primeiros termos so iguais unidade, ou seja, T1 = T2 = 1 - Cada termo, a partir do terceiro, igual soma dos dois termos anteriores, isto : TN = TN-2 + TN-1 Se T18 = 2584 e T21 = 10946 ento T22 igual a:

(IME - 2007)Considere uma pequena bola de gelo de massa M suspensa por um fio de densidade linear de massa e comprimento L temperatura ambiente. Logo abaixo deste fio, h um copo de altura H e dimetro D boiando na gua. Inicialmente o copo est em equilbrio com um comprimento C submerso. Este fio mantido vibrando em sua freqncia natural medida que a bola de gelo derrete e a gua cai no copo. Determine a freqncia de vibrao do fio quando o empuxo for mximo, ou seja, quando o copo perder a sua flutuabilidade. Dados: acelerao da gravidade = g ; massa especfica da gua = .

(IME - 2007/2008)Uma amostra de 0,512 g de uma liga metlica Al-Zn reage com HCl, recolhendo-se o gs formado. Aps a total dissoluo da amostra, o gs recolhido seco, resfriado e submetido a um processo de compresso representado pela reta AB no diagrama P-V. Sabendo que a temperatura mxima ao longo do processo de compresso 298 K, determine o teor de alumnio nesta amostra. Considere que o gs se comporta idealmente.