posted by helpme on .
A ball on the end of a string is revolved at a uniform rate in a vertical circle of radius 72.0 cm, as shown in
Fig. 5–33. If its speed is .4 00 m s and its mass is 0.300 kg, calculate the tension in the string when the ball is
(a) at the top of its path, and (b) at the bottom of its path