A flywheel is a solid disk that rotates about an axis that is perpendicular to t

Question

A flywheel is a solid disk that rotates about an axis that is perpendicular to the disk at its center. Rotating flywheels provide a means for storing energy in the form of rotational kinetic energy and are being considered as a possible alternative to batteries in electric cars. The gasoline burned in a 208-mile trip in a typical midsize car produces about 4.92 x 109 J of energy. How fast would a 44.2-kg flywheel with a radius of 0.430 m have to rotate to store this much energy? Give your answer in rev/min

Explanation / Answer

Rotational kinetic energy is : KE = 0.5I?

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