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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 that passes through a smooth tube as shown in fig. The mass `m` moves around in a circular peth which lies in a horizantal plane. The length of the stribng from the mass `m` to the top of the tube is of length `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 if `M=16kg, m=4kg, l=1m` and `g=pi^(2)m//s^(2)`

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