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Q. A student sits on a rotating stool holding two 3kg objects. When his arms are extended horizontally, the objects are 1m from the axis of rotation, and he rotates with an angular speed of 0.75 rad/s. The moment of inertia of the student plus stool is 3kg•m2 and is assumed to be constant. The student then pulls the objects horizontally to 0.5m from the rotation axis.

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

(b) Find out the kinetic energy of the student before and after the objects are pulled in.

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  • Category:- Physics
  • Reference No.:- M9294626

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