Astudent holds two lead weights, each of mass 6.4 kg. when the students’ arms are extended horizontally, the lead weights are 0.84 m from the axis of rotation and the student rotates with an angular speed of 2.4 rad/sec. the moment of inertia of student plus stool is 9.4 kg m2 and is assumed to be constant; i. e., the student’s arms are massless! then the student pulls the lead weights horizontally to a radius 0.23 m from the axis of rotation.
1). find the new angular speed of the student?
2). find the kinetic energy of the rotating system (comprised of student, stool, and weights) before and after he pulls the weights inward?