College Physics (4th Edition)

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

Chapter 1 - Problems - Page 23: 89

Answer

$10^{11}gal$

Work Step by Step

There are about $3\times10^{8}$ people in US, a reasonable estimate of the number of automobiles would be $1.5\times10^{8}$. There are 365 days per year. Average gasoline used per day is greater than 1 gal, but less than 10 gal, let us take 3 gallons per day. Estimating hence, gal = $1.5\times10^{8}\times365\times3=1642\times10^{8}=10^{11} gal$
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