Answer
$$2.00 \mathrm{Hz}
$$
Work Step by Step
The angular frequency is $\omega=8.00 \pi / 2=4.00 \pi \mathrm{rad} / \mathrm{s}$ , so the frequency is
$$
f=\frac {\omega }{ 2 \pi}=(4.00 \pi \mathrm{rad} / \mathrm{s}) / 2 \pi=2.00 \mathrm{Hz}
$$
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
Published by
Wiley
ISBN 10:
1-11823-072-8
ISBN 13:
978-1-11823-072-5
Chapter 16 - Waves-I - Problems - Page 475: 57a
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