Calculus: Early Transcendentals 8th Edition

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

Chapter 15 - Section 15.8 - Triple Integrals in Cylindrical Coordinates - 15.8 Exercise - Page 1050: 21

Answer

$\dfrac{312,500 \pi}{7}$

Work Step by Step

Set up the integral. $I=\int_0^{\pi} \int_{0}^{2 \pi}\int_{0}^{5} (\rho^4) (\rho^2) \sin \phi d\rho d\theta d\phi=\int_0^{\pi} \int_{0}^{2 \pi}\int_{0}^{5} (\rho^6) \sin \phi d\rho d\theta d\phi$ $=[\int_0^{\pi} \sin \phi d\phi][ \int_{0}^{2 \pi}d\theta][ \int_{0}^{5} \rho^6 d\rho] $ $=[-\cos \phi]_0^{\pi} [\theta]_{0}^{2 \pi} [\dfrac{\rho^7}{7}]_0^5$ $=[-\cos \pi+\cos 0] (1+1) (\dfrac{78125}{7})$ $=(4 \pi) (\dfrac{78125}{7})$ Thus, we have $I=\dfrac{312,500 \pi}{7}$
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