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 · m2 and is assumed to be constant. The student then pulls in the objects horizontally to 0.21 m from the rotation axis. (a) Find the new angular speed of the student. (rads/s) (b) Find the kinetic energy of the student before and after the objects are pulled in. (j) Before: After:

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ISBN:9781305952300
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Chapter1: Units, Trigonometry. And Vectors
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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 · m2 and is assumed to be constant. The student then pulls in the objects horizontally to 0.21 m from the rotation axis.

(a) Find the new angular speed of the student. (rads/s)

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

Before:

After:

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