Two animals of differing masses are in free fall. Which factor is missing so that both animals fall with the exact same velocity ?

Momentum
Interia
Gravity
Air resistance

In raising a 6200-n piano with a pulley system, the movers note that, for every 2.2 m of rope pulled down, the piano rises 0.12 m . ideally, find the force required to lift the piano.

How much work is done lifting a 9.10 kg box straight up onto a shelf that is 1.80 m high?

Unpolarized light whose intensity is 1.19 w/ is incident on a polarizer. (a) what is the intensity of the light leaving the polarizer? (b) if the analyzer is set at an angle of = 41.0∘ with respect to the polarizer, what is the intensity of the light that reaches the photocell?