Critical speed of rotation, N (in rps rotation per second) of a trammel is equal to (where, g = acceleration due to gravity = 9.81 m/sec2 and, r = radius of trammel, metre.) ?

A. (1/?). ?(g/r)

B. ?(g/r)

C. (1/2?). ?(g/r)

D. 2?. ?(g/r)

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