Calculus, 10th Edition (Anton)

Published by Wiley
ISBN 10: 0-47064-772-8
ISBN 13: 978-0-47064-772-1

Chapter 5 - Applications Of The Definite Integral In Geometry, Science, And Engineering - 5.3 Volumes By Cylindrical Shells - Exercises set 5.3 - Page 371: 28

Answer

$\text{The volume is}$ \begin{align} V = \frac{9\pi}{14} \end{align}

Work Step by Step

$\text{It is given that}$ \begin{align} y = x^3; \ x = 0 \ \ and \ \ y = 1 \end{align} $\text{The given region is revolved about y = 1. Meaning that the cross }$ $\text{section generates a cylindircal surface of height $\sqrt[3] y$ and radius (1-y).}$ $\text{Thus, the volume is}$ \begin{align} V = 2\pi \int_0^1 (1-y)\sqrt[3] y \ dy = 2\pi \left[\frac{3y^{\frac{4}{3}}}{4} - \frac{3y^{\frac{7}{3}}}{7}\right]_0^1 = \frac{9\pi}{14} \end{align}
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