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) (1/2π). √(g/r)
(B) (1/π). √(g/r)
(C) ½ √(g/r)
(D) 2π. √(g/r)
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