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A disc of radius r has a light pole fixed perpendicular to the disc at the circumference which in turn has a pendulum of length r attached to its other end. The disc is rotated with a constant angular speed w. The string is making an angle 30degree with the rod. Then the angular speed w is. a) ( √3g/r)^1/2. b) (g/√3r) ^ 1/2. c) ( √3g/2r)^1/2. d) (2g/3√3r)^1/2
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