A crate pushed along the floor with velocity →vj vj slides a distance d after the pushing force is removed. a. If the mass of the crate is doubled but the initial velocity is not changed, what distance does the crate slide before stoping? Explain.
b. If the initial velocity of the crate is doubled to but the mass is not changed, what distance does the crate slide before stopping? Explain.

Two polarizers are oriented at 70∘∘ to one another. unpolarized light falls on them. what fraction of the light intensity is transmitted?

Amoving electron has kinetic energy k1. after a net amount of work w has been done on it, the electron is moving one-quarter as fast in the opposite direction. (a) find w in terms of k1. (b) does your answer depend on the final direction of the electron's motion?

An object with initial temperature 130 ∘ f is submerged in large tank of water whose temperature is 50 ∘ f . find a formula for f ( t ) , the temperature of the object after t minutes, if the cooling constant is k = − 0.2 . remember newton's law of cooling (the rate of change of temperature with respect to time is equal to k times the difference between the temperature of the object and the surrounding temperature) ! : )