Posted by jamieson on Sunday, November 15, 2009 at 5:37pm.
A) Perform a vector addition of the weight and the mass x (centripetal acceleration). The two forces act in perpendicular directions, and the resultant is the tension, T.
B) T sin A = M V^2/R, from a horizontal force balance. Solve for V.
A is the angle of the string from vertical. Solve for V
Use V and R to get the rpm.
2 pi R/T = V
where T is the time required for the ball to go around once, in seconds.
RPM = 60/T
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