A car is designed to get its energy from a rotating solid-disk flywheel with a radius of 2.00 m and a mass of 5.00 × 102 kg. Before a trip, the flywheel is attached to an electric motor, which brings the flywheel’s rotational speed up to 5.00 × 103 rev/min. (a) Find the kinetic energy stored in the flywheel, (b) If the fly-wheel 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.
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