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 330 mile trip in a typical midsize car produces about 1.80 109 J of energy. How fast would a 11 kg flywheel with a radius of 0.33 m have to rotate in order to store this much energy? Give your answer in rev/min.

Explanation / Answer

the angular velocity is found from 1/2*I*w^2 = 1.8*10^9 where I = moment of inertia = 11*0.33^2 /2 . => w = 215.68 rev/min

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