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A student sits on a freely rotating stool holding two dumbbells, each of mass 3.08 kg...

A student sits on a freely rotating stool holding two dumbbells, each of mass 3.08 kg (see figure below). When his arms are extended horizontally (Figure a), the dumbbells are 0.96 m from the axis of rotation and the student rotates with an angular speed of 0.755 rad/s. The moment of inertia of the student plus stool is 2.53 kg · m2 and is assumed to be constant. The student pulls the dumbbells inward horizontally to a position 0.304 m from the rotation axis (Figure b).

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(a) Find the new angular speed of the student.


(b) Find the kinetic energy of the rotating system before and after he pulls the dumbbells inward.

Kbefore =  
Kafter =  
0 0
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