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A car is designed to get its energy from a rotating flywheel in the shape of...

A car is designed to get its energy from a rotating flywheel in the shape of a uniform, solid disk of radius 0.550 m and mass 560 kg. Before a trip, the flywheel is attached to an electric motor, which brings the flywheel's rotational speed up to 5.10 ✕ 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 12.0 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.

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Answer #1

First we calculate the kinetic energy of the flywheel by moment of inertia and rotational speed.

Then we find the time for which the flywheel be able to provide energy to the motor.

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