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A large mass M and a small mass m hang a...

A large mass `M` and a small mass `m` hang at the two ends of string passing through a smooth tube. The mass `m` moves around in a circular path in a horizontal plane. The length of the string from the mass `m` to the top of the tube of the tube is `l` and `theta` is the angle this length makes with the vertical. What should be the frequency of rotation of the mass m so that M remains stationary ?

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The correct Answer is:
`f=(1)/(2pi) sqrt(Mg//ml)`
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