A student sits on a rotating stool holdingtwo 5 kg objects. When his arms are extendedhorizontally, the objects are 0.9 m from the axis of rotation,and he rotates with angular speed of 0.66 rad/sec. The moment of inertiaof the student plus the stool is 8 kg.m2 and is assumed to be constant. The student then pulls theobjects horizontally to a radius 0.31 m from the rotationaxis.
Calculate the change in kinetic energy of the system.Ignore the difference in the moment of inertia contributed by thetwo different arm shapes.