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Questões do ENEM: nível médio

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27.392 questões encontradas. Mostrando a página 1026 de 1370.

  • 2AA6BD0C-B8

    Física

    Física Térmica - Termologia
    UECE · 2012MédioEntre para guardar nos favoritos
    Um sistema constituído por um gás ideal pode evoluir do estado inicial i para os estados finais fI, fII e fIII por três diferentes processos, conforme a figura a seguir.

    Imagem da questão de Física, UECE 2012, Física Térmica - Termologia

    A relação entre as variações de energia interna em cada processo, EI, EII e EIII, é
    Escolha uma alternativa para a questão 2aa6bd0c-b8
  • 2A991EA6-B8

    Física

    Ondas e Propriedades Ondulatórias
    UECE · 2012MédioEntre para guardar nos favoritos
    Dois instantâneos de uma onda harmônica transversal que se propaga na direção x em um meio não dispersivo são mostrados na figura a seguir. A diferença de tempo entre esses instantâneos é de 0,5 s.

    Imagem da questão de Física, UECE 2012, Ondas e Propriedades Ondulatórias

    Assim, a velocidade de propagação da onda é, em m/s,
    Escolha uma alternativa para a questão 2a991ea6-b8
  • 2A92459C-B8

    Física

    Calorimetria
    UECE · 2012MédioEntre para guardar nos favoritos
    Um resistor ôhmico é ligado a uma bateria de tensão V0 para aquecer um volume de água de 24 oC até 37 oC dentro de certo intervalo de tempo, desprezando qualquer perda para o meio ambiente. Para que a mesma quantidade de água seja igualmente aquecida em 25% do tempo anterior, a tensão da bateria deve ser multiplicada por um fator de
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  • 2A8F4961-B8

    Física

    Movimento Harmônico
    UECE · 2012MédioEntre para guardar nos favoritos
    A figura abaixo mostra um instantâneo de dois pulsos que se propagam sem deformação em uma corda. Os pulsos foram gerados nas extremidades opostas da corda, de modo que o representado pela curva tracejada se propague no sentido positivo de x e o outro pulso no sentido negativo. Assuma que a corda é um meio homogêneo e linear para essa propagação, e que os pulsos se propagam com velocidade 2 m/s, em módulo.

    Imagem da questão de Física, UECE 2012, Movimento Harmônico

    Assim, o pico máximo na direção y da corda 1 s após esse instantâneo é
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  • 2A763440-B8

    Física

    Ondas e Propriedades Ondulatórias
    UECE · 2012MédioEntre para guardar nos favoritos
    A figura (i) mostra uma fonte luminosa que faz incidir luz sobre um material semitransparente. Em dois pontos, A e B, mostrados na figura (i), são medidas as intensidades I de luz para vários comprimentos de onda λ, e os resultados são mostrados no gráfico (ii). A curva sólida corresponde à medição em A, e a tracejada, em B. Despreze os efeitos devidos à reflexão de luz no material e considere o experimento realizado no vácuo.

    Imagem da questão de Física, UECE 2012, Ondas e Propriedades Ondulatórias

    Assim, sobre o material, é correto afirmar-se que
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  • 2A66EAA4-B8

    Física

    Dinâmica
    UECE · 2012MédioEntre para guardar nos favoritos
    Considere uma corda A, de massa desprezível, passando por uma polia presa ao teto por outra corda B, conforme a figura a seguir. Pelas duas extremidades da corda A uma pessoa de massa m se pendura e permanece em equilíbrio estático próximo à superfície da Terra. Considere a aceleração gravitacional com módulo g.
    Imagem da questão de Física, UECE 2012, Dinâmica
    A relação entre as tensões nas cordas e o peso da pessoa é
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  • FC66E47A-B7

    Inglês

    Adjetivos | Adjectives
    UECE · 2012MédioEntre para guardar nos favoritos

    TEXT


    The need to constantly adapt is the new reality for many workers, well beyond the information technology business. Car mechanics, librarians, doctors, Hollywood special effects designers — virtually everyone whose job is touched by computing — are being forced to find new, more efficient ways to learn as retooling becomes increasingly important not just to change careers, but simply to stay competitive on their chosen path.

    Going back to school for months or years is not realistic for many workers, who are often left to figure out for themselves what new skills will make them more valuable, or just keep them from obsolescence. In their quest to occupy a useful niche, they are turning to bite-size instructional videos, peer-to-peer forums and virtual college courses.

    Lynda Gratton, a professor of management practice at the London Business School, has coined a term for this necessity: “serial mastery.”

    “You can’t expect that what you’ve become a master in will keep you valuable throughout the whole of your career, and you want to add to that the fact that most people are now going to be working into their 70s,” she said, adding that workers must try to choose specialties that cannot be outsourced or automated. “Being a generalist is, in my view, very unwise. Your major competitor is Wikipedia or Google.”

    Businesses have responded by pouring more money into training, even in the current economic doldrums, according to several measures. They have experimented by paying employees to share their expertise in internal social networks, creating video games that teach and, human resources consultants say, enticing employees with tuition help even if they leave the company.

    Individuals have also shouldered a lot of responsibility for their own upgrades. Lynda.com, which charges $25 a month for access to training videos on topics like the latest version of Photoshop, says its base of individual customers has been growing 42 percent a year since 2008. Online universities like Udacity and Coursera are on pace to double in size in a year, according to Josh Bersin of Bersin & Associates, a consulting firm that specializes in learning and talent management. The number of doctors participating in continuing education programs has more than doubled in the last decade, with the vast majority of the growth stemming from the increased popularity of Internet-based activities, according to the Accreditation Council for Continuing Medical Education in Chicago.

    The struggle is not just to keep up, but to anticipate a future of rapid change. When the AshevilleBuncombe Technical Community College in North Carolina wanted to start a program for developing smartphone and tablet apps, the faculty had to consider the name carefully. “We had this title Mobile Applications, and then we realized that it may not be apps in two years, it may be something else,” said Pamela Silvers, the chairwoman of the business computer technologies department. “So we changed it to Mobile Development.”

    As the metadata and digital archivist at Emory University, Elizabeth Russey Roke, 35, has had to keep up with evolving standards that help different databases share information, learn how to archive “born digital” materials, and use computers to bring literary and social connections among different collections to life. The bulk of her learning has been on the job, supplemented by the occasional course or videos on Lynda.com.

    “For me, it’s easier to learn something in the classroom than it is on my own,” she said. “But I can’t exactly afford another three years of library school.”

    Rapid change is a challenge for traditional universities; textbooks and even journals often lag too far behind the curve to be of help, said Kunal Mehta, a Ph.D. student in bioengineering at Stanford University. His field is so new, and changing so rapidly, he said, that there is little consensus on established practices or necessary skills. “It’s more difficult to know what we should learn,” he said. “We have advisers that we work with, but a lot of times they don’t know any better than us what’s going to happen in the future.” 

    Instead, Mr. Mehta, 26, spends a lot of time comparing notes with others in his field, just as many professionals turn to their peers to help them stay current. The International Automotive Technicians Network, where mechanics pay $15 a month to trade tips on repairs, has more than 75,000 active users today, up from 48,000 in 2006, said Scott Brown, the president. 

    In an economy where new, specialized knowledge is worth so much, it may seem anticompetitive to share expertise. But many professionals say they don’t see it that way. 

    “We’re scattered all over the country, Australia, New Zealand, the U.K., so it never really bothered us that we were sharing the secrets of what we do,” said Bill Moss, whose repair shop in Warrenton, Va., specializes in European cars, and who is a frequent user of peer-to-peer forums. 

    Mr. Moss, 55, said technological advances and proprietary diagnostic tools had forced many garages to specialize. Ten years ago, if his business had hit a slow patch, he said, he would have been quicker to broaden his repertory. “I might have looked at other brands and said, ‘These cars aren’t so bad.’ That’s much harder to do now, based on technology and equipment requirements.” His training budget is about $4,000 a year for each repair technician. 

    Learning curves are not always driven by technology. Managers have to deal with different cultures, different time zones and different generations as well as changing attitudes. As medical director of the Reproductive Science Center of New England, Dr. Samuel C. Pang has used patient focus groups and sensitivity training to help the staff adjust to treating lesbian couples, gay male couples, and transgendered couples who want to have children. This has given the clinic a competitive advantage. 

    “We have had several male couples and lesbian couples come to our program from our competitors’ program because they said they didn’t feel comfortable there,” Dr. Pang said. 

    On top of that, he has to master constantly evolving technology. “The amount of information that I learned in medical school is minuscule,” he said, “compared to what is out there now.” 

     http://www.nytimes.com/2012/09/22

    In questions, sentences from the text may have been modified/adapted to fit certain grammatical structures.


    In the text, the function of the words retooling, turning, training, consulting, and stemming is respectively

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  • FC34949A-B7

    Inglês

    Interpretação de texto | Reading comprehension
    UECE · 2012MédioEntre para guardar nos favoritos

    TEXT


    The need to constantly adapt is the new reality for many workers, well beyond the information technology business. Car mechanics, librarians, doctors, Hollywood special effects designers — virtually everyone whose job is touched by computing — are being forced to find new, more efficient ways to learn as retooling becomes increasingly important not just to change careers, but simply to stay competitive on their chosen path.

    Going back to school for months or years is not realistic for many workers, who are often left to figure out for themselves what new skills will make them more valuable, or just keep them from obsolescence. In their quest to occupy a useful niche, they are turning to bite-size instructional videos, peer-to-peer forums and virtual college courses.

    Lynda Gratton, a professor of management practice at the London Business School, has coined a term for this necessity: “serial mastery.”

    “You can’t expect that what you’ve become a master in will keep you valuable throughout the whole of your career, and you want to add to that the fact that most people are now going to be working into their 70s,” she said, adding that workers must try to choose specialties that cannot be outsourced or automated. “Being a generalist is, in my view, very unwise. Your major competitor is Wikipedia or Google.”

    Businesses have responded by pouring more money into training, even in the current economic doldrums, according to several measures. They have experimented by paying employees to share their expertise in internal social networks, creating video games that teach and, human resources consultants say, enticing employees with tuition help even if they leave the company.

    Individuals have also shouldered a lot of responsibility for their own upgrades. Lynda.com, which charges $25 a month for access to training videos on topics like the latest version of Photoshop, says its base of individual customers has been growing 42 percent a year since 2008. Online universities like Udacity and Coursera are on pace to double in size in a year, according to Josh Bersin of Bersin & Associates, a consulting firm that specializes in learning and talent management. The number of doctors participating in continuing education programs has more than doubled in the last decade, with the vast majority of the growth stemming from the increased popularity of Internet-based activities, according to the Accreditation Council for Continuing Medical Education in Chicago.

    The struggle is not just to keep up, but to anticipate a future of rapid change. When the AshevilleBuncombe Technical Community College in North Carolina wanted to start a program for developing smartphone and tablet apps, the faculty had to consider the name carefully. “We had this title Mobile Applications, and then we realized that it may not be apps in two years, it may be something else,” said Pamela Silvers, the chairwoman of the business computer technologies department. “So we changed it to Mobile Development.”

    As the metadata and digital archivist at Emory University, Elizabeth Russey Roke, 35, has had to keep up with evolving standards that help different databases share information, learn how to archive “born digital” materials, and use computers to bring literary and social connections among different collections to life. The bulk of her learning has been on the job, supplemented by the occasional course or videos on Lynda.com.

    “For me, it’s easier to learn something in the classroom than it is on my own,” she said. “But I can’t exactly afford another three years of library school.”

    Rapid change is a challenge for traditional universities; textbooks and even journals often lag too far behind the curve to be of help, said Kunal Mehta, a Ph.D. student in bioengineering at Stanford University. His field is so new, and changing so rapidly, he said, that there is little consensus on established practices or necessary skills. “It’s more difficult to know what we should learn,” he said. “We have advisers that we work with, but a lot of times they don’t know any better than us what’s going to happen in the future.” 

    Instead, Mr. Mehta, 26, spends a lot of time comparing notes with others in his field, just as many professionals turn to their peers to help them stay current. The International Automotive Technicians Network, where mechanics pay $15 a month to trade tips on repairs, has more than 75,000 active users today, up from 48,000 in 2006, said Scott Brown, the president. 

    In an economy where new, specialized knowledge is worth so much, it may seem anticompetitive to share expertise. But many professionals say they don’t see it that way. 

    “We’re scattered all over the country, Australia, New Zealand, the U.K., so it never really bothered us that we were sharing the secrets of what we do,” said Bill Moss, whose repair shop in Warrenton, Va., specializes in European cars, and who is a frequent user of peer-to-peer forums. 

    Mr. Moss, 55, said technological advances and proprietary diagnostic tools had forced many garages to specialize. Ten years ago, if his business had hit a slow patch, he said, he would have been quicker to broaden his repertory. “I might have looked at other brands and said, ‘These cars aren’t so bad.’ That’s much harder to do now, based on technology and equipment requirements.” His training budget is about $4,000 a year for each repair technician. 

    Learning curves are not always driven by technology. Managers have to deal with different cultures, different time zones and different generations as well as changing attitudes. As medical director of the Reproductive Science Center of New England, Dr. Samuel C. Pang has used patient focus groups and sensitivity training to help the staff adjust to treating lesbian couples, gay male couples, and transgendered couples who want to have children. This has given the clinic a competitive advantage. 

    “We have had several male couples and lesbian couples come to our program from our competitors’ program because they said they didn’t feel comfortable there,” Dr. Pang said. 

    On top of that, he has to master constantly evolving technology. “The amount of information that I learned in medical school is minuscule,” he said, “compared to what is out there now.” 

     http://www.nytimes.com/2012/09/22

    Concerning the reaction of businesses to the constant need of employees’ continuing education, the text states that they
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  • 5A7E3472-B7

    Matemática

    Aritmética e Problemas
    UECE · 2012MédioEntre para guardar nos favoritos
    Um cone circular reto está inscrito em uma esfera, isto é, o vértice do cone e a circunferência que delimita sua base estão sobre a esfera. Se a medida do raio da esfera é 3 m e se a medida da altura do cone é igual a 2/3 da medida do diâmetro da esfera, então o volume do cone, em m3 , é
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  • 5A7A56CB-B7

    Matemática

    Funções Trigonométricas e Funções Trigonométricas Inversas
    UECE · 2012MédioEntre para guardar nos favoritos
    Se x ∈ R, o maior inteiro menor do que ou igual a x é denotado por [x]. Se f, g: R → R são funções definidas por f(x) = cosx e g(x) = [x] , então a interseção do gráfico de f com o gráfico de g é um conjunto
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  • 5A732F3D-B7

    Matemática

    Geometria Plana
    UECE · 2012MédioEntre para guardar nos favoritos
    Em uma região plana os pontos X, Y e Z são tais que a distância de X a Z é 10 m, o ponto Y está ao norte do ponto X e a oeste do ponto Z. No ponto Y ergue-se uma torre cujo ângulo de elevação medido de X é 30° e medido de Z é 45°. Portanto, pode-se afirmar corretamente que a altura da torre é

    Imagem da questão de Matemática, UECE 2012, Geometria Plana
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  • 5A6B28D4-B7

    Matemática

    Circunferências e Círculos
    UECE · 2012MédioEntre para guardar nos favoritos
    Uma circunferência cuja medida do raio é 8 m é dividida em sete arcos de comprimentos iguais. Usando-se o valor 0,4338 para uma aproximação de sen π/7, a medida, em metros, da distância entre as extremidades de um destes arcos é um número situado entre
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