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November 22, 2014

Homework Help: Physics

Posted by Sarah on Wednesday, December 14, 2011 at 4:09pm.

A 645-kg elevator starts from rest. It moves upward for t = 3.13 s with a constant acceleration until it reaches its constant cruising speed of v = 1.26 m/s. It moved 2.75m during that time.
a) What is the average power (W)is delivered by the motor during the initial acceleration of the eleator during the first 3.13s?
b) How much power by the elevator motor while the elevator moves upward now at cruising speed?

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