A student sits on a freely rotating stool holding two weights, each of mass 3.00

Question

A student sits on a freely rotating stool holding two weights, each of mass 3.00 kg (Fig. P10.48). When his arms are extended horizontally, the weights are 1.00 m from the axis of rotation and he rotates with an angular speed of 0.750 rod/s. The moment of inertia of the student plus stool ?s 3.00 kg . m^2 and is assumed to be constant. The student pulls the weights inward horizontally to a position 0.300 m from the rotation axis. (a) Find the new angular speed of the student. (b) Find the kinetic energy of the rotating system before and after he pulls the weights inward. PHY 1321/PHY1331 Principles of Physics I

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A student sits on a freely rotating stool holding two dumbbells, each of mass 2.90 kg (see figure below). When his arms are extended horizontally (figure a), the dumbbells are 0.90 m from the axis of rotation and the student rotates with an angular speed of 0.741 rad/s. The moment of inertia of the student plus stool is 2.51 kg

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