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What will be the time period of a pendul...

What will be the time period of a pendulum which beats seconds ( i.e.,it passes through the mean position after every one second ) it its length is doubled ?
Hint `: T = 2pi sqrt((L)/(g))=2` ....(i)
`T' = 2pi sqrt((2L)/(g)) `
Fin `T'` using equation (i)

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` T = 2pi sqrt((L)/(g))=2` ....(i)
`T. = 2pi sqrt((2L)/(g)) `
Find `T.` using equation (i)
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