Answer
$t = 0.2015~s$
Work Step by Step
We can find the least value of $t$ such that $V = 0.30$:
$V = cos~2\pi~t$
$cos~2\pi~t = 0.30$
$2\pi~t = arccos(0.30)$
$2\pi~t = 1.266$
$t = \frac{1.266}{2\pi}$
$t = 0.2015~s$
Trigonometry (10th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671775
ISBN 13:
978-0-32167-177-6
Chapter 6 - Quiz (Sections 6.1-6.3) - Page 276: 10b
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