A bicycle wheel spins 25 times in 5 seconds. Calculate frequency of the wheel.

15 Hz

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10 Hz

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40 Hz

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5 Hz

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Solution

The correct option is D 5 Hz
Time Period (T) is the number of seconds per waveform, or the number of seconds per oscillation. It is clear that frequency and period are reciprocals.
In this case, A bicycle wheel spins 25 times in 5 seconds.
That is, the frequency is given as $f = \frac{25}{5} = 5 H z$ .
Time period = $\frac{1}{f} = \frac{1}{5} = 0.20 s$
Hence, the frequency is 5 Hz and the time period is 0.20 seconds.

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