Answer
a. $f = \frac{1}{T} = \frac{1}{0.10 s} = 10 Hz$.
b. $f = \frac{1}{T} = \frac{1}{5 s} = 0.2 Hz$.
c. $f = \frac{1}{T} = \frac{1}{\frac{1}{60} s} = 60 Hz$.
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