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A car is designed to get its energy from a rotating flywheelwith a radius of 1.50 m and a mass of475 kg. Before a trip, the flywheel isattached to an electric motor, which brings the flywheel'srotational speed up to 4000 rev/min.

(a) Find the kinetic energy stored in theflywheel.

(b) If the flywheel is to supply energy to the car as would a15.0-hp motor, find the length of timethe car could run before the flywheel would have to be brought backup to speed.

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