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you find out that it takes 2 sec. for the swing to complete one cycle. what is the swing`s period and frequency?

Sagot :

AL2006

The time it takes "to complete one cycle" is a perfect definition for period.
So the 2 sec that you measured is the swing's period.

Frequency is just   1/period  (the 'reciprocal' of the period).
For this swing, the frequency is   1/(2sec)  =  0.5 per second = 0.5 Hz.

( "Hertz" means "per second")