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461Q937583 | Química, Primeiro Dia, ENEM, INEP

O abastecimento de nossas necessidades energéticas futuras dependerá certamente do desenvolvimento de tecnologias para aproveitar a energia solar com maior eficiência. A energia solar é a maior fonte de energia mundial. Num dia ensolarado, por exemplo, aproximadamente 1 kJ de energia solar atinge cada metro quadrado da superfície terrestre por segundo. No entanto, o aproveitamento dessa energia é difícil porque ela é diluída (distribuída por uma área muito extensa) e oscila com o horário e as condições climáticas. O uso efetivo da energia solar depende de formas de estocar a energia coletada para uso posterior.
BROWN, T. Química a Ciência Central. São Paulo: Pearson Prentice Hall, 2005.


Atualmente, uma das formas de se utilizar a energia solar tem sido armazená-la por meio de processos químicos endotérmicos que mais tarde podem ser revertidos para liberar calor. Considerando a reação: CH4(g) + H2O(v) + calor ⇌ CO(g) + 3 H2( g ) e analisando-a como potencial mecanismo para o aproveitamento posterior da energia solar, conclui-se que se trata de uma estratégia


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462Q937590 | Química, Transformações Químicas, Primeiro Dia, ENEM, INEP

As mobilizações para promover um planeta melhor para as futuras gerações são cada vez mais freqüentes. Amaior parte dos meios de transporte de massa é atualmente movida pela queima de um combustível fóssil. A título de exemplificação do ônus causado por essa prática, basta saber que um carro produz, em média, cerca de 200 g de dióxido de carbono por km percorrido.

Revista Aquecimento Global. Ano 2, n° 8. Publicação do Instituto Brasileiro de Cultura Ltda.


Um dos principais constituintes da gasolina é o octano (C 8H18). Por meio da combustão do octano é possível a liberação de energia, permitindo que o carro entre em movimento. A equação que representa a reação química desse processo demonstra que

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463Q1046965 | Matemática, Aritmética e Problemas, Primeiro Dia, ESCOLA NAVAL, Marinha

No sistema decimal, a quantidade de números ímpares positivos menores que 1000, com todos os algarismos distintos é
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464Q1046983 | Matemática, Trigonometria, Primeiro Dia, ESCOLA NAVAL, Marinha

Considere S, a soma das raízes da equação trigonométrica 4 sen3x-5senx-4cos3x+ 5cosx= 0, no intervalo [0,π2] . Qual o valor de tan g S+cos sec 2S 2
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465Q1046984 | Física, Leis de Newton, Primeiro Dia, ESCOLA NAVAL, Marinha

Dois veículos A e B percorrem a mesma trajetória retilínea e horizontal (eixo dos X) . O veículo A (da frente) , de massa ma = 20 kg, está sob a ação da força resultante F(a) = 8,0 î (N) e o veículo B (detrás), de massa mB= 30kg, está sob a ação da força resultante F(b) =9,0 î (N). No instante t= 0, temos: o módulo da velocidade do veículo A é duas vezes maior do que o módulo da velocidade do veículo B e a velocidade de A em relação a B é2,0.î (m/ s). No instante t= 5,0s, o módulo da velocidade (em m/ s) do centro de massa do sistema (A + B) é
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466Q1046750 | Matemática, Geometria Plana, Primeiro Dia, COLÉGIO NAVAL, Marinha, 2019

Seja ABCD um quadrado de lado 1 e centro em ‘0. Considere a circunferência de centro em 'o e raio 3/7. A área 'S' da região externa ao círculo considerado e interna ao quadrado é tal que:
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467Q1046789 | Matemática, Funções, Primeiro Dia, ESCOLA NAVAL, Marinha, 2019

Sabendo que f é uma função definida por f{x) = xx e que D é o domínio de f, é correto afirmar que:
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468Q1046796 | Inglês, Interpretação de Texto Reading Comprehension, Primeiro Dia, ESCOLA NAVAL, Marinha, 2019

Texto associado.
Based on the text below, answer the six questions that follow it. The paragraphs of the text are numbered.

If children lose contact with nature they won't fight for it

[1] According to recent research, even if the present rate of global decarbonisation were to double, we would still be on course for 6°C of warming by the end of the century. Limiting the rise to 2°C, which is the target of current policies, requires a six-time reduction in carbon intensity.
[2] A new report shows that the UK has lost 20% of its breeding birds since 1966: once common species such as willow tits, lesser spotted woodpeckers and turtle doves have all but collapsed; even house sparrows have fallen by two thirds. Ash dieback is just one of many terrifying plant diseases, mostly spread by trade. They now threaten our oaks, pines and chestnuts.
[3] While the surveys show that the great majority of people would like to see the living planet protected, few are prepared to take action. This, I think, reflects a second environmental crisis: the removal of children from the natural world. The young people we might have expected to lead the defence of nature have less and less to do with it.
[4] We don't have to undervalue the indoor world, which has its own rich ecosystem, to lament children's disconnection from the outdoor world. But the experiences the two spheres offer are entirely different. There is no substitute for what takes place outdoors, mostly because the greatest joys of nature are unplanned. The thought that most of our children will never swim among phosphorescent plankton at night, will never be startled by a salmon leaping, or a dolphin breaching is almost as sad as the thought that their children might not have the opportunity.
[5] The remarkable collapse of children's engagement with nature - which is even faster than the collapse of the natural world - is recorded in Richard Louv's book Last Child in the Woods, and in a report published recently by the National Trust. Since the 1970s the area in which children may roam without supervision has decreased by almost 90%. In one generation the proportion of children regularly playing in wild places in the UK has fallen from more than half to fewer than one in 10. In the US, in just six years (1997-2003) children with particular outdoor hobbies fell by half. Eleven- to 15-year-olds in Britain now spend, on average, half their waking day in front of a screen.
[6] There are several reasons for this collapse: parents' irrational fear of strangers and rational fear of traffic, the destruction of the fortifying lands where previous generations played, the quality of indoor entertainment, the structuring of children's time, the criminalisation of natural play. The great indoors, as a result, has become a far more dangerous place than the diminished world beyond.
[7] The rise of obesity and asthma and the decline in cardio-respiratory fitness are well documented. Louv also links the indoor life to an increase in attention deficit hyperactivity disorder and other mental ill health. Research conducted at the University of Illinois suggests that playing among trees and grass is associated with a markedreduction in indications of ADHD, while playing indoors appears to increase them. The disorder, Louv suggests, "may be a set of symptoms aggravated by lack of exposure to nature". Perhaps it's the environment, not the child, that has gone wrong.
[8] In her famous essay the Ecology of Imagination in Childhood, Edith Cobb proposed that contact with nature stimulates creativity. Reviewing the biographies of 300 "geniuses", she exposed a common theme: intense experiences of the natural world in the middle age of childhood (between five and 12). Animals and plants, she argued, are among "the figures of speech in the rhetoric of play... which the genius, in particular of later life, seems to remember".
[9] Studies in several nations show that children's games are more creative in green places than in concrete playgrounds. Natural spaces encourage fantasy and roleplay, reasoning and observation. The social standing of children there depends less on physical dominance, more on inventiveness and language skills.
[10] And here we meet the other great loss. Most of those I know who fight for nature are people who spent their childhoods immersed in it. Without a feel for the texture and function of the natural world, without an intensity of engagement almost impossible in the absence of early experience, people will not devote their lives to its protection.
[11] Forest Schools, Outward Bound, Woodcraft Folk, the John Muir Award, the Campaign for Adventure, Natural Connections, family nature clubs and many others are trying to bring children and the natural world back together. But all of them are fighting forces which, if they cannot be changed, will deprive the living planet of the wonder and delight that for millennia have attracted children to the wilds.

(Adapted from: https://www.theguardian.com/commentisfree/2012/nov/19/children-lose-contact-with-nature)
According to the text, which option is correct?
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469Q1046798 | Inglês, Vocabulário Vocabulary, Primeiro Dia, ESCOLA NAVAL, Marinha, 2019

Which option completes the dialogue below correctly?
John: What’s the matter? Mary: My notebook isn’t working properly. I must call the technician and________ immediately.
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470Q1046802 | Inglês, Vocabulário Vocabulary, Primeiro Dia, ESCOLA NAVAL, Marinha, 2019

Which option completes the paragraph below correctly?
After a particularly long week in Shanghai and Beijing, several of u s ________ on a United flight direct to Chicago on a late Friday afternoon. We ________ at the airport only to find out the company________ the flight right before takeoff.
(Adapted from https://www.linkedin.com/pulse)
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471Q1046812 | Inglês, Interpretação de Texto Reading Comprehension, Primeiro Dia, COLÉGIO NAVAL, Marinha, 2020

Texto associado.
Meditation: A simple, fast way to reduce stress

Meditation can wipe away the day's stress, bringing with it inner peace. See how you can easily learn to practice meditation whenever you need it most.

By Mayo Clinic Staff


If stress has you anxious, tense and worried, consider trying meditation. Spending even a few minutes in meditation can restore your calm and inner peace.
Anyone can practice meditation. It's simple and inexpensive, and it doesn't require any special equipment.
And you can practice meditation wherever you are - whether you're out for a walk, riding the bus, waiting at the doctor's office or even in the middle of a difficult business meeting.
Meditation has been practiced for thousands of years.Meditation originally was meant to help deepen understanding of the sacred and mystical forces of life. These days, meditation is commonly used for relaxation and stress reduction.
Meditation is considered a type of mind-body complementary medicine.Meditation can produce a deep state of relaxation and a tranquil mind.
During meditation, you focus your attention and eliminate the stream of jumbled thoughts that may be crowding your mind and causing stress. This process may result in enhanced physical and emotional well-being.

Benefits of meditation

Meditation can give you a sense of calm, peace and balance that can benefit both your emotional well-being and your overall health.
And these benefits don't end when your meditation session ends. Meditation can help carry you more calmly through your day and may help you manage symptoms of certain medical conditions.

Adapted from: <https://www.mayoclinic.org/testsprocedures/meditation/in-depth/meditation/art-20045858>
Mark the correct option according to the text.
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472Q937593 | Biologia, Primeiro Dia, ENEM, INEP

De 15% a 20% da área de um canavial precisa ser renovada anualmente. Entre o período de corte e o de plantação de novas canas, os produtores estão optando por plantar leguminosas, pois elas fixam nitrogênio no solo, um adubo natural para a cana. Essa opção de rotação é agronomicamente favorável, de forma que municípios canavieiros são hoje grandes produtores de soja, amendoim e feijão.
As encruzilhadas da fome. Planeta. São Paulo, ano 36, n0. 430, jul. 2008 (adaptado).

A rotação de culturas citada no texto pode beneficiar economicamente os produtores de cana porque

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473Q1046909 | Inglês, Interpretação de Texto Reading Comprehension, Primeiro Dia, COLÉGIO NAVAL, Marinha, 2021

Texto associado.

Read text Ili to answer question.

Text III

Causes and Effects of Climate Change

Glaciers are melting, sea levels are rising, cloud forests are dying, and wildlife is scrambling to keep pace. lt has become clear that humans have caused most of the past century's warming by releasing heat-trapping gases as we power our modem tives. Called greenhouse gases, their leveis are higher now than at any time in the last 800,000 years.



We often call the result global warming, but it is causing a set of changes to the Earth's climate, or long-term weather patterns, that varies from place to place. While many people think of global warming and climate change as synonyms, scientists use "climate change" when describing the complex shífts now affecting our planet's weather and climate systems - in part because some areas actually get cooler in the short term.



Climate change encampasses not only rising average temperatures but also extreme weather events, shifting wildlife populations and habitats, rising seas, and a range of other impacts. Ali of those changes are emerging as humans continue to add heat-trapping greenhouse gases to the atmosphere, changing the rhythms of climate that ali living things have come to rely on.



What will we do - what can we do - to slow this humancaused warming? How will we cape with the changes we ___ into motion? While we struggle to figure it ali out, the fate of the Earth as we know it - coasts, forests, farms, and snow-capped mountains - hangs in the balance.


By Christina Nunez Adapted from


https://www.nationalgeographic.com/environment/article/global-warming-overview


What's the meaning of the expression hangs in the balance in "... coasts, forests, farms, and snow-capped mountains - hangs in the balance."? lt
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474Q680832 | Matemática, Problemas, Primeiro Dia, FGV, FGV, 2020

Fátima usou suas economias para comprar dólares, gastando R$ 46.400,00. Se Fátima tivesse feito a compra um ano atrás, com o mesmo montante, em reais, ela teria comprado US$ 1.280,00 a mais, já que o preço de compra do dólar era R$ 0,80 menor. Desconsiderando-se taxas e impostos, a cotação de compra de um dólar, em reais, quando Fátima fez o investimento era um número pertencente ao intervalo de números reais dado por
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475Q1046967 | Matemática, Progressões, Primeiro Dia, ESCOLA NAVAL, Marinha

Considere X1, X2 e X3 ∈ ℜ raízes da equação 64x3-56x2+ 14x-1= 0.
Sabendo que X1, X2 e X3 são termos consecutivos de uma P. G e estão em ordem decrescente, podemos afirmar que o valor da expressão sen [ (X1 + X2) π ] + tg [ (4X1 X3)π ] vale
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476Q1046749 | Matemática, Álgebra, Primeiro Dia, COLÉGIO NAVAL, Marinha, 2019

Multiplicando os valores reais distintos que resolvem a equação (x3 - 6x2 + 12x - 4)2 - 15(x3 - 6x2 + 12x - 4) + 36 = 0, encontra-se, como resultado:
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477Q1046805 | Matemática, Geometria Plana, Primeiro Dia, COLÉGIO NAVAL, Marinha, 2020

Quantos são os valores distintos de n, para os quais 102 n 202, e n é a quantidade de lados de um polígono convexo cuja soma dos ângulos internos resulta num quadrado perfeito?
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478Q1046816 | Inglês, Verbos Verbs, Primeiro Dia, ESCOLA NAVAL, Marinha, 2020

Which option completes the text below correctly?
Renew or replace your adult passport
You ______ be aged 16 or over (or turning 16 in the next 3 weeks). if you want an adult passport. There's a different process to get a passport for a child.
The rules for passports, drivlnq, pet travel and more ______ change from 1 January 2021. Act now so you _____ travel as planned.
If you're in the UK you _____.
-renew your passport if it's expired or will expire soon; - replace your passport if it's been lost, stolen or damaged; - change the details on your passport.

(Adapted from <https://www.gov.uk/renew-adult-passport>)
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479Q1046818 | Inglês, Interpretação de Texto Reading Comprehension, Primeiro Dia, ESCOLA NAVAL, Marinha, 2020

Analyze the questions below.

I- Who does this pencil belong to? Il- Who read a book last week? III- Where did your mother born? IV- What about are they talking? V- What fell on the floor yesterday?

Choose the correct option.
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480Q1046905 | Matemática, Aritmética e Problemas, Primeiro Dia, COLÉGIO NAVAL, Marinha, 2021

Na natureza há bactérias que se multiplicam tão rapidamente que dobram de volume a cada minuto. Partindo-se de uma bactéria, em 50min um ambiente estará cheio de bactérias. Em quanto tempo, aproximadamente, esse mesmo processo irá acontecer se o estudo for feito com duas bactérias idênticas.
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