A teacher sits on a freely rotating stool holding two, Physics

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A teacher sits on a freely rotating stool holding two

A teacher sits on a freely rotating stool holding two weights, each of mass 2.60 kg. When her arms are extended horizontally, the weights are ri = 0.800 m from the axis of rotation, and she rotates with an angular speed of ?i = 0.640 rad/s. The moment of inertia of the teacher and the stool is 2.50 kg? m2. When the teacher pulls her arms in horizontally to a position of rf = 0.200 m from the axis of rotation, determine new angular speed of the teacher-stool-weight system.

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