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 360 mile trip in a typical midsize car produces about 1.90 109 J of energy. How fast would a 11 kg flywheel with a radius of 0.27 m have to rotate in order to store this much energy? Give your answer in rev/min.
___________ rev/min

Explanation / Answer

E=1.4*10^9 J m=16kg r=.22m I=.5*16kg*.22^2 = .3872 1.4*10^9=.5*.3872*w^2 w=85037.67 rev/m

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