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# Physics

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An oscillating body (Pendulum)

Makes 1 amplitude in 0.02 seconds

What is its frequency?

May 10, 2019

#1
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Not clear (to me!) exactly what you mean.  Do you mean one period is 0.02s, or the time between the mid-line and the maximum (or minimum) is 0.02s, in which case the period would be 4*0.02s or 0.08s (or do you mean something else?)?  Either way the frequency is given by frequency = 2pi/period.

May 10, 2019
#2
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Sorry..

The periodic time is 0.08 second. (I found it by 4*0.02 as you did)

Frequency = 1/periodic time

1/0.08 = 12.5HZ Is that correct ??

To clear:

1 Amplitude = 1/4 periodic time = 1/4 complete oscillation

so 4 amplitudes = periodic time of 1 complete oscillation

May 10, 2019
edited by Guest  May 10, 2019
#3
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My expression for frequency produces a result in radians per second (angular frequency), yours is in cycles per second or Hz (so, yes, 12.5 Hz).

I should have noted that in my reply.

Alan  May 10, 2019
edited by Alan  May 10, 2019
edited by Alan  May 10, 2019