Calculus: Early Transcendentals 8th Edition

Published by Cengage Learning
ISBN 10: 1285741552
ISBN 13: 978-1-28574-155-0

Chapter 16 - Section 16.2 - Line Integrals - 16.2 Exercise - Page 1086: 40

Answer

$\dfrac{7}{3}+\dfrac{e^2-e}{2}$

Work Step by Step

The work done is given by: $W=\int_C F\cdot dr=\int_0^{1} (y^2+1)^2(2y dy)+ye^{y^2+1} dy=\int_0^{1} 2y (y^2+1)^2+ye^{y^2+1} dy$ Suppose $y^2+1=p \implies 2y dy =dp$ Thus, we have $W=\int_C F\cdot dr=\int_1^2 p^2+\dfrac{e^p}{2} dp=[\dfrac{p^3}{3}+\dfrac{e^p}{2}]_1^{2}=[\dfrac{2^3}{3}+\dfrac{e^2}{2}]-[\dfrac{1^3}{3}+\dfrac{e^1}{2}]=\dfrac{7}{3}+\dfrac{e^2-e}{2}$
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