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An oscillating body (Pendulum)

Makes 1 amplitude in 0.02 seconds

What is its frequency? 

 May 10, 2019
 #1
avatar+28363 
+3

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
avatar+28363 
+2

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

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