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as shown above. The entire system rotates at constant angular velocity about the axis of the rod.

A ball of mass m is attached by two strings to a vertical rod. as shown above. The entire system rotates at constant angular velocity  about the axis of the rod.
a) Assuming  is large enough to keep both strings taut, find the force each string exerts on the ball in terms of , m, g, R, and .
b) Find the minimum angular velocity, min for which the lower string barely remains taut.

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