Answer
Plot $II$
Work Step by Step
Let us set $v$ as constant, say $k$.
$x=sinu$, $y=cosu sink$, $z=sink$
Let us name $sink$ as $a$
$x=sinu$, $y=acosu$, $z=a$
This is an ellipse parallel to $xy$ plane.
Only Plot $II$ has such grid curves.
Calculus 8th Edition
by Stewart, James
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: 18
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