Calculus 8th Edition

Published by Cengage
ISBN 10: 1285740629
ISBN 13: 978-1-28574-062-1

Chapter 16 - Vector Calculus - 16.6 Parametric Surfaces and Their Areas - 16.6 Exercises - Page 1160: 4

Answer

Elliptical cylinder with an $x$ radius of $2$, $y$ radius of $3$, and $z$ radius of between $0$ and $2$.

Work Step by Step

Given: $r(u,v)=2 sinu i+3cosuj+vk$; $0\leq v\leq 2$ Write the vector equation in its equivalent parametric equations: $x=2 sinu $, $y= 3cosu $ and $z=v$ Solving the first two parametric equation yields: $\frac{x}{2}= sinu $ and $\frac{x}{3}= cosu $ Therefore, $\frac{x^{2}}{2^{2}}+\frac{y^{2}}{3^{2}}= sin^{2}u+cos^{2}u$ $\frac{x^{2}}{2^{2}}+\frac{y^{2}}{3^{2}}=1$ which represents as a equation of a Elliptical cylinder with an $x$ radius of $2$, $y$ radius of $3$, and $z$ radius of between $0$ and $2$.
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