(a) Find the useful power output (in W) of an elevator motor that lifts a 2800...
Find the useful power output of an elevator motor that lifts a 2500-kg load a height of 35 m in 17 s, if it also increases the speed from rest to 4.25 m/s. Note that the total mass of the counterbalanced system is 10,000 kg--so that only 2500 kg is raised in height, but the full 10000 kg is accelerated.
QUESTION 10 Power, P, is defined as the rate at which work, W, is done, or the work divided by the time, t, over which that work occurs: P = W / t. Starting from rest, at the bottom of a flight of stairs, what is the power output for a person of mass 55 kg who runs up a flight of stairs of height 3.0 m and reaches the top of the stairs, in a time of 3.0 s,...
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,...