Conceptual Physics (12th Edition)

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

Chapter 14 - Think and Solve: 40


As suggested, find your volume by dividing your weight (in newtons) by water's weight density. The weight density of water is $9800 \frac{N}{m^{3}}$ (page 230). The buoyant force is the weight of the displaced air, so multiply your volume by the weight density of air. On page 271, the latter number is given as $12 \frac{N}{m^{3}}$. As an example, if your weight is 490 N, for example (roughly 110 lb), your volume is (490/9800) = 0.05 cubic meters. The buoyant force is (0.05)(12) = about 0.6 N, roughly the weight of a large egg.

Work Step by Step

This is discussed on page 271.
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