Na figura a seguir, um bloco de massa m = 1 kg, preso a uma mola, por meio de um fio ideal, a comprime em 10 cm. Determine a altura máxima H, em metros, alcançada pelo bloco, após o fio ser cortado. Considere a constante elástica da mola igual a k = 1000 N/m, a trajetória de A até B sem atrito e a aceleração da gravidade g = 10 m/s² .

Leia o trecho da Canção de Renato Russo e, em seguida, assinale a alternativa incorreta quanto ao emprego das normas gramaticais.

“Mas é claro que o Sol vai voltar amanhã/ Mais uma vez, eu sei [...]”

Carlos, professor de Física, procurou, em uma de suas aulas, discutir com seus alunos a facilidade de girar uma porca, com auxílio de uma chave, conforme a figura a seguir. Explicou, então, aos alunos que, para que as forças F₁ e F₂ , de instensidades distintas, possibilitem à porca, a mesma facilidade de girar em torno do seu eixo, o valor da intensidade de F₂ deverá ser:

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Hero pilot safely lands passenger plane with no front wheels as sparks fly from nose of jet

A pilot safely landed a passenger plane without using its front wheels after they failed to deploy on arrival at the airport.

Video footage of the emergency touchdown showed sparks flying from the nose of the aircraft as it slid along the runway in Myanmar.

None of the 82 passengers and seven flight crew were injured during the incident at Mandalay International Airport.

Myanmar National Airlines said in a statement that the pilot, Captain Myat Moe Aung, was alerted to the problem by the plane’s Engine Indicating and Crew Alerting System (EICAS).

He informed the control tower and tried a backup emergency procedure to pull down the wheels on the Brazilian-made Embraer 190-LR.

The pilot then carried out two fly-bys of the runway to allow air controllers to check visually whether the landing gear had deployed.

After dumping fuel to reduce the landing weight, he brought the aircraft in to land on its rear wheels before the nose slowly tipped down to make contact with the runway at 9.09am on Sunday.

“The pilot did a great job,” said Win Khant, permanent secretary of transportation and telecommunication ministry.

A video posted online by one of the passengers showed smoke spreading through the plane before they evacuated the aircraft.

Several of the passengers were smiling as they walked away from the plane.

Flight operations at the airport were suspended for several hours as a result of the incident, which is now under investigation.

“Myanmar national airlines would like to thank all passengers and our crew on board,” the company said in a statement.

Last week a Biman Bangladesh Airlines plane skidded off the runway after landing in bad weather in Yangon. At least 15 crew and passengers were injured.

www.independent.co.uk

These are verbs from the text. Choose the alternative in which we can find only irregular verbs.

De acordo com as regras de pontuação, assinale a alternativa correta.

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Woman wins Picasso painting worth €1m in raffle

An Italian woman has won a painting by Pablo Picasso, worth about €1m (£900,000; $1.1m), in a raffle after being given the ticket as a gift.

The winning ticket was pulled out during a live draw at Christie’s auction house in Paris.

The event, which was fundraising for Care charity, had been postponed twice - first to sell more tickets, and then because of coronavirus restrictions.

The prize painting, Nature Morte, is a still life from 1921.

It is a relatively small artwork - measuring 9in by 18in (23cm by 46cm) - which shows a glass of absinthe and a newspaper on a table.

In total €5.1m was raised for the charity by selling 51,000 raffle tickets at €100 each. About 29% of the tickets were sold in France, followed by the US and Switzerland.

Organisers said that €4.2m of proceeds will go towards clean water projects in schools and villages in Madagascar, Morocco and Cameroon.

David Nahmad, the billionaire collector from Monaco who supplied the Picasso painting, will be given €900,000. He also donated €100,000 to Care, organisers said.

“Picasso would have loved an operation like this, because he was someone with a lot of interest in humanitarian and social causes,” sale organiser Peri Cochin told Reuters news agency.

Adapted from www.bbc.com

Choose the right alternative according to the text.

Read the text a n d answer question.

The Chronicles of Narnia - The Lion, the Witch and the Wardrobe

The Lion, the Witch and the Wardrobe, completed by the end of March 1949 and published by Geoffrey Bles in the United Kingdom on 16 October 1950, tells the story of four ordinary children: Peter, Susan, Edmund, and Lucy Pevensie, who evacuated to the English countryside from London following the outbreak of World War II. They discover a wardrobe in Professor Digory Kirke’s house that leads to the magical land of Narnia. The Pevensie children help Aslan, a talking lion, save Narnia from the evil White Witch, who has reigned over the land of Narnia for a century of perpetual winter with no Christmas. The children become kings and queens of this new-found land and establish the Golden Age of Narnia, leaving a legacy to be rediscovered in later books.

Adapted from www.en.wipedia.org/wiki/the_lion_the_witch_and_the_wardrobe

Keeping in mind the structure of the Present Perfect Tense, fill the blank in the text.

Choose the alternative that substitutes the phrasal verb in the following sentence without changing its meaning.

“My mother asked me to look after my little sister”.

Read the text a n d answer question.

Hero pilot safely lands passenger plane with no front wheels as sparks fly from nose of jet

A pilot safely landed a passenger plane without using its front wheels after they failed to deploy on arrival at the airport.

Video footage of the emergency touchdown showed sparks flying from the nose of the aircraft as it slid along the runway in Myanmar.

None of the 82 passengers and seven flight crew were injured during the incident at Mandalay International Airport.

Myanmar National Airlines said in a statement that the pilot, Captain Myat Moe Aung, was alerted to the problem by the plane’s Engine Indicating and Crew Alerting System (EICAS).

He informed the control tower and tried a backup emergency procedure to pull down the wheels on the Brazilian-made Embraer 190-LR.

The pilot then carried out two fly-bys of the runway to allow air controllers to check visually whether the landing gear had deployed.

After dumping fuel to reduce the landing weight, he brought the aircraft in to land on its rear wheels before the nose slowly tipped down to make contact with the runway at 9.09am on Sunday.

“The pilot did a great job,” said Win Khant, permanent secretary of transportation and telecommunication ministry.

A video posted online by one of the passengers showed smoke spreading through the plane before they evacuated the aircraft.

Several of the passengers were smiling as they walked away from the plane.

Flight operations at the airport were suspended for several hours as a result of the incident, which is now under investigation.

“Myanmar national airlines would like to thank all passengers and our crew on board,” the company said in a statement.

Last week a Biman Bangladesh Airlines plane skidded off the runway after landing in bad weather in Yangon. At least 15 crew and passengers were injured.

www.independent.co.uk

The correct information from the text is:

Num mesmo local, foram comparados dois cubos maciços e homogêneos, de dimensões idênticas. Ao serem verificadas suas massas, a uma mesma temperatura ambiente, foi observado que estas eram distintas.

Nesse contexto, considere as seguintes afirmações:

I - Os cubos são feitos de materiais diferentes.

II - Os cubos são feitos de um mesmo material.

III - Ao mergulharmos os cubos num mesmo líquido, é possível que um deles afunde e que o outro flutue.

IV - Ao mergulharmos os cubos num mesmo líquido, um deles irá afundar e o outro flutuar.

Com relação às afirmações apresentadas, podemos afirmar que: