A student sits on a rotating stool holding two 3.0-kg objects.When his arms are extended horizontally, the objects are 1.0 mfrom the axis of rotation and he rotates with an angular speedof 0.75 rad/s. The moment of inertia of the student plus stoolis 3.0 kg . m2 and is assumed to be constant. The student thenpulls in the objects horizontally to 0.30 m from the rotationaxis. (a) Find the new angular speed of the student. (b) Findthe kinetic energy of the student before and after the objectsare pulled in.

Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter10: Rotational Motion
Section: Chapter Questions
Problem 56P: A student sits on a freely rotating stool holding two dumbbells, each of mass 3.00 kg (Fig. P10.56)....
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A student sits on a rotating stool holding two 3.0-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 0.30 m from the rotation
axis. (a) Find the new angular speed of the student. (b) Find
the kinetic energy of the student before and after the objects
are pulled in.

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