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 453-mile trip in a typical midsize car produces about 4.00 x 109 J of energy. How fast would a 47.9-kg flywheel with a radius of 0.362 m have to rotate to store this much energy? Give your answer in rev/min.

Explanation / Answer

K.E=0.5m(wr)^2 4x10^9=0.5x47.9*0.362^2*w^2 w=35700

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