Need help on getting the resonant frequency

AI Thread Summary
To calculate the resonant frequency of a pendulum, use the formula for the period of a simple pendulum, which is T = 2π√(L/g), where L is the length of the pendulum and g is the acceleration due to gravity (approximately 9.81 m/s²). The resonant frequency (f) can then be found using the formula f = 1/T. The discussion highlights the need to determine the period before and after the child kicks, which changes the effective length of the pendulum. Understanding these formulas will help in calculating the resonant frequencies for both scenarios.
xuhhad
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A 25.0-kg child in Red Deer pumps herself on a swing when she kicks upward on the downswing, thus changing the distance from the pivot point to her centre of gravity from 2.40 m to 2.28 m.

1)The resonant frequency of her swing before the kick is: ___ Hz, and the resonant frequency after the kick is: _____ Hz.

I don't want the answer i just want a hint or a formula i am supposed to use for this, please and thank u. Because my textbook has no examples of it.
 
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Think of the child as a pendulum.
 
Doc Al said:
Think of the child as a pendulum.

Yes but what do i do from there i am really confused
 
xuhhad said:
Yes but what do i do from there i am really confused
What's the period of a simple pendulum?
 
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