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23 Nov 2019
A student sits on a freely rotating stool holding two weights, eachof mass 3.03 kg. When his arms are extended horizontally, theweights are 1.08 m from the axis of rotation and he rotates with anangular speed of 0.760 rad/s. The moment of inertia of the studentplus stool is 3.03 kg·m2 and is assumed to be constant. The studentpulls the weights inward horizontally to a position 0.298 m fromthe rotation axis.
(a) Find the new angular speed of the student.
(b) Find the kinetic energy of the rotating system before and afterhe pulls the weights inward.
A student sits on a freely rotating stool holding two weights, eachof mass 3.03 kg. When his arms are extended horizontally, theweights are 1.08 m from the axis of rotation and he rotates with anangular speed of 0.760 rad/s. The moment of inertia of the studentplus stool is 3.03 kg·m2 and is assumed to be constant. The studentpulls the weights inward horizontally to a position 0.298 m fromthe rotation axis.
(a) Find the new angular speed of the student.
(b) Find the kinetic energy of the rotating system before and afterhe pulls the weights inward.
