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October 25, 2014

Homework Help: Physics*

Posted by Allie on Thursday, October 20, 2011 at 12:39pm.

A car is designed to get its energy from a rotating flywheel (solid disk) with a radius of 1.00 m and a mass of 575 kg. Before a trip, the flywheel is attached to an electric motor, which brings the flywheel's rotational speed up to 5,000 rev/min.
(a) Find the kinetic energy stored in the flywheel.
Answer in J

(b) If the flywheel is to supply energy to the car as a 10.0-hp motor would, find the length of time the car could run before the flywheel would have to be brought back up to speed.
Answer in h

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