A car is designed to get its energy from a rotating flywheel in the shape of a uniform, solid disk of radius 0.600 m and mass 520 kg. Before a trip, the flywheel is attached to an electric motor, which brings the flywheel's rotational speed up to 4.90 ✕ 103 rev/min. (A) Find the kinetic energy stored in the flywheel (in J). (B) If the flywheel is to supply energy to the car as a 11.0 hp motor would, find the length of time in hours the car could run before the flywheel would have to be brought back up to speed. ___H

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