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 432-mile trip in a typical
midsize car produces about 3.47 x 109 J of energy. How fast would a
25.4-kg flywheel with a radius of 0.326 m have to rotate to store
this much energy? Give your answer in rev/min.