Todas as questões do ENEM

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Al Capone

    Born in 1899 in Brooklyn, New York, to poor immigrant parents, Al Capone went on to become the most infamous gangster in American history. In 1920 during the height of Prohibition, Capone’s multi-million dollar Chicago operation in bootlegging, prostitution and gambling dominated the organized crime scene. Capone was responsible for many brutal acts of violence, mainly against other gangsters. The most famous of these was the St. Valentine’s Day Massacre in 1929, in which he ordered the assassination of seven rivals. Capone was never indicted for his racketeering but was finally brought to justice for income-tax evasion in 1931. After serving six-and-a-half years, Capone was released. He died in 1947 in Miami. Capone’s life captured the public imagination, and his gangster persona has been immortalized in the many movies and books inspired by his exploits.

(Excerpt from the site: http://www.history.com/topics/alcapone. Researched on: October 2015)

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W.H.O. calls ‘vaccine hesitancy’ an increasing concern globally

Rick Gladstone

August 18, 2015

    The World Health Organization warned Tuesday of what it called the growing problem of “vaccine hesitancy,” when people delay or refuse vaccines for themselves or their children. In a statement on its website, the organization called the problem “a growing challenge for countries seeking to close the immunization gap.” Globally, the organization said, one in five children still do not receive routine lifesaving immunizations, and 1.5 million children die each year of diseases that could have been thwarted by vaccines.

(www.nytimes.com)

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Social life in youth may impact health decades later

Robert Preidt

August 6, 2015

    Having good social connections at age 20 can lead to improved well-being later in life, a new study suggests. Previous research has shown that people with poor social links are at increased risk for early death. “In fact, having few social connections is equivalent to tobacco use, and [the risk is] higher than for those who drink excessive amounts of alcohol, or who suffer from obesity,” study author Cheryl Carmichael, who conducted the study while a doctoral candidate at the University of Rochester in New York, said in a university news release.

    The study included 133 people who enrolled when they were 20-year-old college students in the 1970s. The participants kept track of their daily social interactions at ages 20 and 30. At age 50, they completed an online survey about the quality of their social lives and emotional well-being, including questions about loneliness and depression, and their relationships with close friends.

    The findings showed that frequent social interactions at age 20 and good-quality relationships – defined as intimate and satisfying – at age 30 were associated with higher levels of well-being at age 50. The study findings were published in a recent issue of the journal Psychology and Aging.

    A high number of social interactions at age 20 are beneficial later in life because they help young adults determine who they are, the researchers said. “It’s often around this age that we meet people from diverse backgrounds, with opinions and values that are different from our own, and we learn how to best manage those differences,” said Carmichael, now an assistant professor of psychology at Brooklyn College. “Considering everything else that goes on in life over those 30 years – marriage, raising a family and building a career – it is extraordinary that there appears to be a relationship between the kinds of interactions college students and young adults have and their emotional health later in life,” she concluded.

(www.nlm.nih.gov)

“Foi quando meu vestido me reteve: alguma coisa se enganchara na minha saia. Voltei-me e vi que se tratava de uma mão pequena e escura. Pertencia a um menino a que a sujeira e o sangue interno davam um tom quente de pele.” (1° parágrafo)

A passagem narra o momento inicial do encontro da narradora com seu interlocutor. Tal momento é caracterizado

Em uma atividade experimental, um estudante é desafiado a descobrir a resistência elétrica ôhmica do conteúdo de uma caixa que esconde componentes do circuito elétrico representado na figura. Além do conteúdo da caixa, o circuito é constituído por dois resistores ôhmicos, um gerador ideal, um amperímetro ideal e fios de resistência desprezível. 

O estudante observa que, quando o circuito está em funcionamento, o amperímetro indica 2 A. Considerando essas informações, a resistência equivalente dos resistores associados dentro da caixa é igual a

Na figura, um texto é visto através de duas lentes esféricas, 1 e 2. A imagem formada pela lente 1 aparece menor do que o próprio texto e a imagem formada pela lente 2 aparece maior.

(http://pontociencia.org.br. Adaptado.)

Pela observação da figura, constata-se que a lente 1 é               e a imagem por ela formada é               e que a lente 2 é            e a imagem por ela formada é             .

Assinale a alternativa que preenche, correta e respectivamente, as lacunas apresentadas acima.

Do alto de uma ponte, um garoto deixa cair um tijolo maciço e impermeável nas águas paradas de um lago. Ao chocar-se contra a superfície da água, o tijolo não se parte e afunda verticalmente, até parar no fundo do lago.

À medida que afunda, a densidade do tijolo e o módulo do empuxo E exercido pela água sobre ele são, respectivamente,