A car is designed to get its energy from a rotating flywheel with a radius of 2.

Question

A car is designed to get its energy from a rotating flywheel with a radius of 2.25 m and a mass of 550 kg. The flywheel can be considered as a uniform thin cylinder. Before a trip, the flywheel is attached to an electric motor, which brings the flywheel's rotational speed up to 4600 rev/min. What is the kinetic energy stored in the flywheel? For this park i got 161525033 J and this was correct but I can't get part B which is.. B.) If the flywheel is to supply energy to the car as would a 20-hp motor, find the length of time the car could run before the flywheel would have to be brought back up to speed.

Explanation / Answer

KE= 161525033 J 20 hp = 20 X 746 = 14920 W. = J/s we have 161525033 joules. so, they are gonna last for , 10826.07 seconds.

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