1) A solid cylinder (or disk) of stone, with a mass of 95.0 kg and a radius of 3.09 meters, rolls without slipping from the top of a 15.0-m tall hill, starting from rest.

When the disk reaches the bottom, the speed of the disk's center of mass is 7.20 m/s. what is the rotational kinetic energy of the disk at the bottom of the incline?

2) A 5.0-kg cylinder (solid disk) with a radius of 15.0 cm is spun by a rope as shown in the figure. The rope has a constant tension of 15 N.