Calculus 8th Edition

Published by Cengage
ISBN 10: 1285740629
ISBN 13: 978-1-28574-062-1

Chapter 2 - Derivatives - 2.7 Rates of Change in the Natural and Social Sciences - 2.7 Exercises - Page 179: 23

Answer

(a) $\frac{dV}{dP}$ = $-\frac{C}{P^{2}}$ (b) From the formula for $\frac{dV}{dP}$ in part (a), we see that as $P$ increases, the absolute value of $\frac{dV}{dP}$ decreases. Thus, the volume is decreasing more rapidly at the beginning. (c) $β$ = $-\frac{1}{V}{\frac{dV}{dP}}$ = $-\frac{1}{V}(-\frac{C}{P^{2}})$ = $\frac{C}{(PV)P}$ = $\frac{C}{CP}$ = $\frac{1}{P}$

Work Step by Step

(a) $PV$ = $C$ $V$ = $\frac{C}{P}$ $\frac{dV}{dP}$ = $-\frac{C}{P^{2}}$ (b) From the formula for $\frac{dV}{dP}$ in part (a), we see that as $P$ increases, the absolute value of $\frac{dV}{dP}$ decreases. Thus, the volume is decreasing more rapidly at the beginning. (c) $β$ = $-\frac{1}{V}{\frac{dV}{dP}}$ = $-\frac{1}{V}(-\frac{C}{P^{2}})$ = $\frac{C}{(PV)P}$ = $\frac{C}{CP}$ = $\frac{1}{P}$
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