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.