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A flywheel is a solid disk that rotates about an axis that is perpendicular to the disk at its center. Rotati?

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

KE = 1/2 I omega squared.

I is the moment of inertia. I don't remember right offhand the moment of inertia of a disk, but your book probably gives it to you (unless you have taken calculus and can integrate to find it). Convert the units from rad/sec to rev/minute by multiplying by 60 over 2pi.

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100 MAXFLI Rev Solid Revolution Rev Distance More Used Golf Balls    US $34.95

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