Question

A toy elevator is raised from the ground floor to the second floor in 20 seconds. The power need using 1000 J of work, is 20,000 W. 100 W. 50 W. 1000 W. 20 W. It is correct to say that impulse is equal to a corresponding change In momentum. force multiplied by the distance it act velocity multiplied by time. momentum. A skydiver steps from a helicopter and falls for a few seconds until terminal velocity is reach Thereafter, until he opens his parachute, his acceleration decreases. is constant. increases. is zero. none of the above If you do work on a skateboard loaded with friends in one-third the usual time, you expend three times the usual power. one third as much power. the usual power. need more information. Recoil is noticeable if we throw a heavy ball while standing on roller skates. If instead we g through the motions of throwing the ball but hold onto it, our net recoil will be A) the same as before. small but noticeable. zero. A feather and a coin dropped in a vacuum fall with equal accelerations. kinetic energies. forces due to gravity. none of these The amount of force needed to sustain motion of a rock in outer space is a force equal to its weight. a force less than its weight if friction is absent. none of these A 5000-kg freight car moving at 2 m/s colludes with a 10,000-kg freight car at rest. The upon collision and move away at 2m/s. 1 m/s. 2/3 m/s. 1/3

Answer 1

2osec Falce option-FX