A rotating flywheel has been proposed as a means of temporarily storing mechanical energy in an automobile providing an energy source for the car. The energy that can be stored in this way is limited by the size and weight of the flywheel and by the maximum angular velocity it can attain without flying apart. Suppose a solid cylindrical flywheel of radius 0.90 m and mass 85.0 kg rotates at an angular velocity of 225 rad / s What is the rotational energy of the flywheel ?

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