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Two balls of mass m each are hung side by side two long threads, each of length l. If the distance between the upper end

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Two balls of mass m each are hung side by side two long threads, each of length l. If the distance between the upper end is r then find the distance r′ between the centres of the ball in terms of g, r, l and m.

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Best answer

m1 = m2 = m

Solving for r’, we get 

The value of r’ is 2lgm.

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