Multivariable Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 0-53849-787-4
ISBN 13: 978-0-53849-787-9

Chapter 16 - Vector Calculus - 16.2 Exercises - Page 1098: 40

Answer

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

Work Step by Step

Work done: $W=\int_C F\cdot dr=\int_0^{1} (y^2+1)^2(2y dy)+ye^{y^2+1} dy$ or, $=\int_0^{1} 2y (y^2+1)^2+ye^{y^2+1} dy$ Plug $y^2+1=k \implies 2y dy =dk$ Work done: $W=\int_C F\cdot dr=\int_1^2 k^2+\dfrac{e^k}{2} dk$ or, $=[\dfrac{k^3}{3}+\dfrac{e^k}{2}]_1^{2}$ or, $=[\dfrac{2^3}{3}+\dfrac{e^2}{2}]-[\dfrac{1^3}{3}+\dfrac{e^1}{2}]$ Hence, Work done, $W=\dfrac{7}{3}+\dfrac{e^2-e}{2}$
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