February 23, 2017

Homework Help: Physics

Posted by Jessica on Tuesday, November 27, 2012 at 10:59pm.

A student sits on a rotating stool holding two 3.4-kg objects. When his arms are extended horizontally, the objects are 1.0 m 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 3.0 kg ยท m2 and is assumed to be constant. The student then pulls in the objects horizontally to 0.45 m from the rotation axis.
(a) Find the new angular speed of the student. (rad/s)
(b) Find the kinetic energy of the student before and after the objects are pulled in.

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