A student sits on a rotating stool holding two 2 kg objects. When his arms are extended

horizontally, the objects are 1 m from the axis

of rotation, and he rotates with angular speed

of 0.61 rad/sec. The moment of inertia of the

student plus the stool is 6 kg m2

and is assumed to be constant. The student then pulls

the objects horizontally to a radius 0.27 m

from the rotation axis.

Calculate the final angular speed of the

student.

Answer in units of rad/s.

part 2

Calculate the change in kinetic energy of the

system.

Answer in units of J.