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 207-mile trip in a typical midsize car produces about 3.91 x 109 J of energy. How fast would a 21.7-kg flywheel with a radius of 0.319 m have to rotate to store this much energy? Give your answer in rev/min.

Explanation / Answer

Given: The trip distance is irrelevant as we are given the amount of energy expended = 1.6 x 109 J of energy. (I assume that the 109 is an exponent) Flywheel mass 40.5kg Flywheel radius .438 meters Solve for rev/min

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