Asked Feb 20, 2007, 08:18 AM
A 550 kg elevator starts from rest. It moves upward for 5.00 s with constant acceleration until it reaches its cruising speed, 1.75 m/s.
(a) What is the average power of the elevator motor during this period?
(b) How does this power compare with the motor power when the elevator moves at its cruising speed?
Pcruising = W
The formula for average power is avg. power = work/change in time
However, I am not sure how to find the work in the problem since no force or angle is given... Is gravity the only force doing work and is the angle 90?