Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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Chapter 10, Problem 49P
(a)
To determine
To Calculate: The resulting angular speed of the platform.
(b)
To determine
To Calculate: The change in kinetic energy of the system
(c)
To determine
To Explain: The place from where the increase in energy comes.
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A rotating table, with moment of inertia 29 kg·m2, is spinning at 40 rpm. A piece of clay is dropped onto the table, where it sticks a distance 1.2 m from the rotational axis. If the final angular speed of the rotating table and clay is 32 rpm, what is the mass of the clay?
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You stand on a frictional platform that is rotating at 1.6 rev/s. Your arms are outstretched, and you hold a heavy weight in each hand. The moment of inertia of you, the extended weights, and the platform is 7.9 kg · m2. When you pull the weights in toward your body, the moment of inertia decreases to 3.7 kg · m2.
(a) What is the resulting angular speed of the platform?(b) What is the change in kinetic energy of the system?(c) Where did this increase in energy come from? (Select all that apply.)
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Chapter 10 Solutions
Physics for Scientists and Engineers
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