Questões de Vestibular: INATEL

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41 Q678272 | Física, Eletricidade, Junho, Inatel, INATEL

Considerando uma partícula com carga elétrica de 100 . 10−6 C que se desloca em um meio com velocidade v. Sabendo ainda que neste meio tem-se um campo magnético com indução magnética de 2 . 10−3 T, com linhas de força perpendiculares à direção do movimento da partícula, determinar a velocidade da partícula sabendo que a força magnética que atua na partícula em movimento é de 10 . 10−4 N:

42 Q678284 | Português, Coesão e coerência, Junho, Inatel, INATEL

As crianças andavam pelas calçadas, despreocupadas, como se não existisse perigo algum, mas os vigilantes continuavam tomando tranquilamente seus cafés.

A alternativa que apresenta o elemento de coesão que corrige o texto acima é:

43 Q678547 | Física, Calorimetria, Julho, Inatel, INATEL

Em relação aos processos de transferência de calor, assinale a alternativa falsa:

45 Q678270 | Física, MCUV, Junho, Inatel, INATEL

Uma partícula na periferia de uma roda de raio 100 cm, inicialmente em repouso, descreve um movimento circular uniformemente variado com aceleração angular constante de 5π rad/s². Considerando θo = 0°, o número de voltas realizadas pela partícula no tempo de 10 s é de:

46 Q678287 | Inglês, Junho, Inatel, INATEL

Texto associado.
First ever black hole image released.

Astronomers have taken the first ever image of a black hole, which is located in a distant galaxy. It measures 40 billion km across - three million times the size of the Earth - and has been described by scientists as "a monster".

The black hole is 500 million trillion km away and was photographed by a network of eight telescopes across the world It was captured by the Event Horizon Telescope (EHT), a network of eight linked telescopes.

Prof Heino Falcke, of Radboud University in the Netherlands, who proposed the experiment, told BBC News that the black hole was found in a galaxy called M87.

"What we see is larger than the size of our entire Solar System," he said.

"It has a mass 6.5 billion times that of the Sun. And it is one of the heaviest black holes that we think exists. It is an absolute monster, the heavyweight champion of black holes in the Universe."

The image shows an intensely bright "ring of fire", as Prof Falcke describes it, surrounding a perfectly circular dark hole. The bright halo is caused by superheated gas falling into the hole. The light is brighter than all the billions of other stars in the galaxy combined - which is why it can be seen at such distance from Earth.

The edge of the dark circle at the centre is the point at which the gas enters the black hole, which is an object that has such a large gravitational pull, not even light can escape.

The image matches what theoretical physicists and indeed, Hollywood directors, imagined black holes would look like, according to Dr Ziri Younsi, of University College London - who is part of the EHT collaboration.

"Although they are relatively simple objects, black holes raise some of the most complex questions about the nature of space and time, and ultimately of our existence," he said.

"It is remarkable that the image we observe is so similar to that which we obtain from our theoretical calculations. So far, it looks like Einstein is correct once again."

But having the first image will enable researchers to learn more about these mysterious objects. They will be keen to look out for ways in which the black hole departs from what's expected in physics. No-one really knows how the bright ring around the hole is created. Even more intriguing is the question of what happens when an object falls into a black hole.

Source: www.bbc.com/news/science-environment-47873592
Which statement is considered incorrect or false in the text above. (Text Comprehension)

47 Q678566 | Inglês, Julho, Inatel, INATEL

Texto associado.
A fire gutted parts of Notre Dame Cathedral and altered the Paris skyline


Paris (CNN) A catastrophic fire engulfed Notre Dame Cathedral in Paris on Monday, altering the city's skyline and threatening a potent symbol of Catholicism at the start of Holy Week.

The fire burned for several hours, destroying the 850-year-old cathedral's iconic spire and roof before firefighters contained the blaze early Tuesday morning.

A pair of bell towers immortalized in Victor Hugo's tale "The Hunchback of Notre Dame" survived, along with the cathedral's elaborate stonework facade. Officials said invaluable artifacts were saved, including the Crown of Thorns, believed to be a relic of the passion of Christ.

President Emmanuel Macron lamented the destruction of an awe-inspiring building that embodied the heart of Paris for more than 800 years. But he pledged to rebuild, starting with the launch of an international fundraising campaign.

"Notre Dame is our history, it's our literature, it's our imagery. It's the place where we live our greatest moments, from wars to pandemics to liberations," he said.

"This history is ours. And it burns. It burns and I know the sadness so many of our fellow French feel."
The Paris prosecutor opened an investigation into the fire, the cause of which is still unknown.


Hundreds of firefighters were deployed to the scene, snarled by rush hour traffic.

For much of the afternoon, flames and plumes of smoke billowed from the cathedral as firefighters in cranes sprayed water onto the structure.

The cathedral was undergoing renovation work, the fire service said.

'Madness'
The fire, just days before Easter, was met with horror by Parisians and tourists.

As firefighters battled the blaze, Parisians gathered outside the church Monday night, raising their voices in prayer.

"It's awful to see such a symbol disappearing in front of you. It's been there for so many years and in a few minutes half of it disappeared ... crazy.

"Paris without Notre Dame, madness."

Source: www.cnn.com/2019/04/15/world/note-dame-cathedral-fire/index.html

“President Emmanuel Macron lamented the destruction of an awe-inspiring building” […] (Passive Voice)

48 Q678557 | Matemática, Geometria Plana, Julho, Inatel, INATEL

Sabendo que o centro da circunferência da questão anterior se encontra a uma distância de 5 unidades do ponto P (a, 1) um dos valores possíveis de a é dado por:
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