Todas as questões do ENEM

Qual característica fundamental pode ser interpretada no texto acima?

Três teses sobre o avanço da febre amarela  

NATHALIA PASSARINHO
Adaptado de bbc.com, 06/02/2018.  

Três teses sobre o avanço da febre amarela  

NATHALIA PASSARINHO
Adaptado de bbc.com, 06/02/2018.  

Três teses sobre o avanço da febre amarela  

NATHALIA PASSARINHO
Adaptado de bbc.com, 06/02/2018.  

Adaptado de Almanak Administrativo, Mercantil e Industrial do Rio de Janeiro (RJ) – 1844 a 1885

Os relatos sobre as ondas epidêmicas de febre amarela na cidade do Rio de Janeiro apareceram com frequência nos periódicos, especialmente a partir da década de 1850.

De acordo com o documento acima, no início da década de 1870, o alastramento da doença era associado ao seguinte fator:

Observe o excerto do texto — ouvindo de seu pai o pouco, o nada que ele sabe das coisas, mas pegando dele seu jeito de amar — sério, quieto, devagar (linhas 22-25). Considere agora as afirmações que são feitas a seguir, a partir do excerto em tela.

I. Nesse trecho da narrativa, é introduzido um novo narrador.

II. No excerto, o enunciador refere-se a si mesmo na terceira pessoa.

III. A mudança da 1a para a 3a pessoa sugere distanciamento do narrador, minimizando assim sua responsabilidade pelo que é dito.

Está correto o que se afirma

Suponha que um comerciante inescrupuloso aumente o valor assinalado pela sua balança, empurrando sorrateiramente o prato para baixo com uma força de módulo 5,0 N, na direção e sentido indicados na figura.




Com essa prática, ele consegue fazer com que uma mercadoria de massa 1,5 kg seja medida por essa balança como se tivesse massa de

                         FOR CATS, A BIG GULP WITH A TOUCH OF THE TONGUE

             It has taken four highly qualified engineers and a bunch of integral equations to figure it out, but we now know how cats drink. The answer is: very elegantly, and not at all the way you might suppose. Cats lap water so fast that the human eye cannot follow what is happening, which is why the trick had apparently escaped attention until now. With the use of high-speed photography, the neatness of the feline solution has been captured. The act of drinking may seem like no big deal for anyone who can fully close his mouth to create suction, as people can. But the various species that cannot do so - and that includes most adult carnivores - must resort to some other mechanism. Dog owners are familiar with the unseemly lapping noises that ensue when their thirsty pet meets a bowl of water. The dog is thrusting its tongue into the water, forming a crude cup with it and hauling the liquid back into the muzzle.
             Cats, both big and little, are so much classier, according to new research by Pedro M. Reis and Roman Stocker of the Massachusetts Institute of Technology, joined by Sunghwan Jung of the Virginia Polytechnic Institute and Jeffrey M. Aristoff of Princeton. Writing in the Thursday issue of Science, the four engineers report that the cat’s lapping method depends on its instinctive ability to calculate the balance between opposing gravitational and inertial forces. What happens is that the cat darts its tongue, curving the upper side downward so that the tip lightly touches the surface of the water.
             The tongue is then pulled upward at high speed, drawing a column of water behind it. Just at the moment that gravity finally overcomes the rush of the water and starts to pull the column down - snap! The cat’s jaws have closed over the jet of water and swallowed it. The cat laps four times a second - too fast for the human eye to see anything but a blur - and its tongue moves at a speed of one meter per second. Being engineers, the cat-lapping team next tested its findings with a machine that mimicked a cat’s tongue, using a glass disk at the end of a piston to serve as the tip. After calculating things like the Froude number and the aspect ratio, they were able to figure out how fast a cat should lap to get the greatest amount of water into its mouth. The cats, it turns out, were way ahead of them - they lap at just that speed. To the scientific mind, the next obvious question is whether bigger cats should lap at different speeds.


WADE, Nicholas. For cats, a big gulp with a touch of the tongue. Disponível em: Acesso em: 20 nov. 2010.


Qual é o significado do substantivo sublinhado na seguinte oração?

"The neatness of the feline solution has been captured".