Calculus: Early Transcendentals 9th Edition

Published by Cengage Learning
ISBN 10: 1337613924
ISBN 13: 978-1-33761-392-7

Chapter 6 - Section 6.3 - Volumes by Cylindrical Shells - 6.3 Exercises - Page 465: 10

Answer

$V = \frac{{62}}{5}\pi $

Work Step by Step

$$\eqalign{ & y = {x^3},{\text{ }}y = 0,{\text{ }}x = 1,{\text{ }}x = 2 \cr & {\text{Apply the shell method about the }}y{\text{ - axis}}{\text{.}} \cr & V = \int_a^b {2\pi x} f\left( x \right)dx,{\text{ where }}0 \leqslant a \leqslant b \cr & {\text{Therefore}}{\text{,}} \cr & V = \int_1^2 {2\pi x\left( {{x^3}} \right)} dx \cr & V = 2\pi \int_1^2 {{x^4}} dx \cr & {\text{Integrating}} \cr & V = 2\pi \left[ {\frac{{{x^5}}}{5}} \right]_1^2 \cr & V = \frac{{2\pi }}{5}\left[ {{x^5}} \right]_1^2 \cr & {\text{Evaluating}} \cr & V = \frac{{2\pi }}{5}\left[ {{{\left( 2 \right)}^5} - {{\left( 1 \right)}^5}} \right] \cr & V = \frac{{2\pi }}{5}\left( {32 - 1} \right) \cr & V = \frac{{62}}{5}\pi \cr} $$
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