A student sits on a freely rotating stool holding twodumbbells, each of mass 3.00 kg

Chapter 11, Problem 34

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A student sits on a freely rotating stool holding twodumbbells, each of mass 3.00 kg (Fig. P11.34). Whenhis arms are extended horizontally (Fig. P11.34a), thedumbbells are 1.00 m from the axis of rotation and thestudent rotates with an angular speed of 0.750 rad/s.The moment of inertia of the student plus stool is3.00 kg m2 and is assumed to be constant. The studentpulls the dumbbells inward horizontally to a position0.300 m from the rotation axis (Fig. P11.34b). (a) Findthe new angular speed of the student. (b) Find thekinetic energy of the rotating system before and afterhe pulls the dumbbells inward

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