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A student sits on a rotating stool holding two 3.0 kg objects. When his arms are extendedhorizontally, the objects are 1.0 m from the axis of rotation, andhe rotates with an angular speed of 0.75 rad/s. The moment ofinertia of the student plus stool is 3.0 kgm2 and isassumed to be constant. The student then pulls the objectshorizontally to 0.20 m from therotation axis.
(a) Find the new angular speed of thestudent.
rad/s
(b) Find the kinetic energy of the student before and after theobjects are pulled in.
before J
after J
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