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A car is designed to get its energy from a rotating flywheel (solid disk) with a radius of 2.00 m and a mass of 500 kg.

A car is designed to get its energy from a rotating flywheel (solid disk) with a radius of 2.00 m and a mass of 500 kg. Before a trip, the flywheel is attached to an electric motor, which brings the flywheel's rotational speed up to 4000 rev/min.

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