Joe ties a ball of mass m = 0.5 kg onto a string of radius R = 1.5 m. He then whirls the ball around in a horizontal circle so that it completes 2 revolutions each second.
For the moment, assume that the string is perfectly horizontal, and ignore the force of gravity.
Of course, in real life, the string is not perfectly horizontal. Instead, it dips slightly from Joe's hand to the ball, at some angle below the horizontal.
Suppose that all else remains the same: m = 0.5 kg, R = 1.5 m, and the ball completes 2 revolutions per second.
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