1. The problem statement, all variables and given/known data Picture: http://img151.imageshack.us/img151/9393/physicszn8.jpg A ball on the end of a string is cleverly revolved at a uniform rate in a vertical circle of radius 60.0 cm, as shown in Fig. 5-33. Its speed is 4.00 m/s and its mass is 0.300 kg. (a) Calculate the tension in the string when the ball is at the top of its path. 2. Relevant equations EF = ma 3. The attempt at a solution EF = ma Ft + Fg = ma Ft = mac - Fg Ft = ((mv^2)/r)) + mg Ft = 8 - 5.88 Ft = 2.12 This answer is incorrect.