Homework Help: Physics

Posted by Nick on Thursday, December 20, 2012 at 9:45am.

A(n) 563 kg elevator starts from rest. It moves upward for 3.18 s with a constant acceleration until it reaches its cruising speed of 1.96 m/s. The acceleration of gravity is 9.8 m/s 2 . Find the average power delivered by the elevator motor during this period. Answer in units of kW

Physics - drwls, Thursday, December 20, 2012 at 11:07am
The elevator accelerates at a = 1.96/3.18 = 0.6134 m/s^2

The height increase during the acceleration period is
H = (1/2) a t^2 = 3.10 m

The energy gain during that interval is
M*g*H + (M/2)*V^2

Divide by the time interval for the average power

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