Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 7 - Think and Discuss: 119

Answer

If the satellite is moving in a circular orbit, no work is done on the satellite (because the net force on it is radially inward, perpendicular to its motion that is directed tangentially). The work-energy theorem confirms that no change in the satellite's energy occurs. The orbit is circular so the PE doesn't change, so the KE is also constant, i.e., it moves at constant speed.
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