Thomas' Calculus 13th Edition

Published by Pearson
ISBN 10: 0-32187-896-5
ISBN 13: 978-0-32187-896-0

Chapter 6: Applications of Definite Integrals - Section 6.4 - Areas of Surfaces of Revolution - Exercises 6.4 - Page 342: 32

Answer

$\dfrac{12 \pi}{5}$

Work Step by Step

Our aim is to integrate the integral to compute the surface area. In order to solve the integral, we have: $Surface \space Area(S_A)= (2 \pi)\int_{a}^{b} y \sqrt {1+(\dfrac{dy}{dx})^2}$ or, $ =(2 \pi)\int_{0}^{1} (2) \dfrac{(1-x^{2/3})^{3/2}}{x^{1/3}} dx $ Suppose $a =1- x^{2/3} \implies da= \dfrac{-2}{3x^{1/3}} dx$ or, $=-6 \pi \int_{0}^{1} a^{3/2} da$ or, $= -6 \pi [\dfrac{2a^{5/2}}{5}]_0^1$ or, $=\dfrac{12 \pi}{5}$
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.