Aflywheel 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 310-mile trip in a typical midsize car produces about 1.10 109 j of energy. how fast would a 12-kg flywheel with a radius of 0.32 m have to rotate to store this much energy? give your answer in rev/min.