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Exercício de Questão de fisica

por Cássia Schiavi () Difícil Wednesday, February 14th, 2018

Exercício:

Uma montanha russa está passando por teste com um carrinho de 120 kg. Uma parte da pista é um looping vertical de raio 12 m. Na parte mais baixa (A) do looping a velocidade do carrinho é 25m/s e na parte mais alta (B) é de 8 m/s. Quanto trabalho é realizado pela força de “ATRITO” quando o carrinho vai do ponto A ao ponto B?

 

A) -16875 J

B) -5400 J

C) -2700 J

D) -10800 J

E)  5400 J

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Respostas:

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