O número “de mols de oxigênio necessário para a combustão completa de dois mois de octano (C₈H₁₈) É igual a:

Examine a figura abaixo:

Uma barra condutora, de comprimento a = 1,0 m e resistência elétrica 10 Ω, está presa por dois pontos de solda, R e S, a uma haste metálica em forma de U de resistência elétrica desprezível que se encontra fixa sobre uma mesa, numa região de campo magnético B, conforme indica a figura acima. Ao disparo de um cronômetro, o módulo do campo magnético começa a variar no tempo segundo a equação B = 3,0 + 4,0t, onde o campo magnético é medido em tesla e o tempo, em segundos. Sabe-se que os pontos de solda romperão, se uma força igual ou superior a 40 N for aplicada a cada um deles. Assim, qual é o instante, em segundos, em que os pontos de solda R e S romperão?

Uma fonte pontual emite som isotropicamente com uma potência de 16W. Se esse som é interceptado por um microfone distante d = 100 m da fonte, em uma área de 0,320 cm²? a potência recebida, em nanowatts, é de:

Assinale a opção que apresenta o elemento com maior eletronegatividade.

What is the correct option to complete the paragraph below?

The Battle of Tarawa was a disaster from the start. _______ November 1943, _______ their first big foray in the central Pacific Ocean, US forces invaded this atoll _______ the Gilbert Islands, hoping to dislodge Japanese troops and push closer to Tokyo. But as soon as the assault began, it literally ran aground. Most of the landing boats smashed _______ a shallow coral reef, forcing marines to flounder their way to shore _______ Japanese gunfire. One in five US troops died in the battle - 300 _______ the reef alone.

(Adapted from https://doi.org/10.1038/d41586-022-02287-6)

What is the correct option to complete the paragraph below?

The effects of too little sleep _______ something Rogulja herself _______ on a regular basis. "Last night I _______ sleep well and I can feel it," she says. "So I can, kind of, intuitively _______ to these animals that we _______."

(Adapted from https:/www.npr.org)

Mark the only sentence that is grammatically INCORRECT.

What is the correct option to complete the text below?

8 Great Projects Apple Killed Like lts Electric Car

The Apple Car is one of the highest-profile projects Apple failed to complete, but it's far from the only one.

_________ being renowned for its innovations, Apple has had no choice but to abandon several projects over the past decades.

Here, we'll take a trip down memory lane and revisit Apple's canceled projects and other products that didn't make the market.

(Adapted from htips:/www.makeuseof.com)

Mark the correct option to complete the sentences below.

I- She never argued with her father. They __________ very well most of the time.

II- Tim's such a liar! Last night he __________ all sorts of stories. We almost believed him!

III- I couldn't find my glasses. I __________ them everywhere!

IV- Jack __________ that his partner was embezzling money from their company.

V- Unfortunately the party was__________. It was raining too heavily.

Which option completes the text below correctly?

Air Forces first Grey Wolf patrol helicopter arrives at Malmstrom

The first field-ready MH-139 Grey Wolf arrived at Montana's Malmstrom Air Force Base earlier this month, marking the start of operations for a new fleet of aircraft designed to safeguard America's land-based nuclear missiles.

The MH-139 Grey Wolf helicopter, _______ replaces Vietnam War-era Hueys, will be used to patrol the intercontinental ballistic missile fields at Malmstrom; F.E. Warren AFB, Wyoming: and Minot AFB, North Dakota.

(Adapted from https:/wvww.militarytimes.com)