A grinding wheel in the shape of a solid disk is 0.210 m in diameter and has a mass of 2.50 kg. The wheel is rotating at 2500 rpm about an axis through its center. a) What is its kinetic energy? (in J)
b) How far would it have to drop in free fall to acquire the same amount of kinetic energy? (h=___m)

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final