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A girl is swinging on a swing in the sit...

A girl is swinging on a swing in the sitting position. How will the period of swing be affected if she stands up?

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The girl and the swing together constitute a pendulum of the period,
`T=2pisqrt((l)/(g))`
As the girl stand up, her E.G is raised the distance between the point of suspension and the C.G decrease i.e. length l decrease . Hence the time period T decrease.
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