College Physics
4th Edition
ISBN: 9780134610467
Author: Knight, Randall Dewey, Jones, Brian, Field, Stuart
Publisher: Pearson,
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Textbook Question
Chapter 13, Problem 52GP
As discussed in Section 13.3, a person’s percentage of body fat can be estimated by weighing the person both in air and underwater, from which the average density ρavg can be calculated. A widely used equation that relates average body density to fat percentage is the Siri equation, % body fat= (495/ρavg – 450, where ρavg is measured in g/cm3. One person’s weight in air is 947 N while his weight underwater is 44 N. What is his percentage of body fat?
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