Answer
(a) both $r$ and $\theta$
Work Step by Step
The coordinate of any point can be represented as $(\mathrm{rcos} \theta, \mathrm{rsin} \theta)$ so the variables are both $r$ and $\theta$.
College Physics (7th Edition)
by Wilson, Jerry D.; Buffa, Anthony J.; Lou, Bo
Published by
Pearson
ISBN 10:
0-32160-183-1
ISBN 13:
978-0-32160-183-4
Chapter 7 - Circular Motion and Gravitation - Learning Path Questions and Exercises - Multiple Choice Questions - Page 258: 2
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