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# Estimate the force a person must exert on a string attached to a

Estimate the force a person must exert on a string attached to a .11 kg ball to make the ball revolve in a horizontal circle of radius .6 m. The ball makes 1.8 revolutions per second. Do not ignore the weight of the ball. In particular, find the magnitude of Ft, and the angle it makes with the horizontal. [hint: set the horizontal component of Ft equal to MAc; also, since there is no vertical motion, what can you say about the vertical component of Ft?]

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