College Physics (4th Edition)

Published by McGraw-Hill Education
ISBN 10: 0073512141
ISBN 13: 978-0-07351-214-3

Chapter 1 - Problems - Page 22: 69

Answer

$10^{5}$ hairs

Work Step by Step

There are about $10^{3}$ hairs in a one-square-inch area of the average human head. An order of magnitude estimate of the area of the average human head is 100 sq-inches. The estimate = $1000hairs/in^{2}\times 100in^{2}=10^{5} hairs$
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