Answer
The frequency is $~~40~Hz$
Work Step by Step
It is given in the problem that the semicircle rotates 40 times each second.
Therefore, the frequency is $~~40~Hz$
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 30 - Induction and Inductance - Problems - Page 897: 21a
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