2. Uma partícula de 3 kg parte do repouso em x=0 e se move sob a acção de uma única força (SI). Calcule a) o trabalho da força quando a partícula se desloca de x= 0 até x = 3m b)a potência proporcionada à partícula no ponto x

Which of the following represents a virtual image?

When the velocity of an object is doubled, by what factor is its momentum changed? by what factor is its kinetic energy changed? a) the momentum is zero. b) the momentum is not zero. c) difficult to say.

Which of the following explains why it took so long for the public to accept the negative health effects of smoking? a)people were waiting for counter reasons, and those were presented. b)scientists had not completely finalized their results, which took 30 years. c)cigarettes were cheaply available and media channels were very inefficient. d)cigarette manufacturers were trying hard to bring an alternative into the market