1, A 150-g ball at the end of a string is revolving uniformly in a horizontal circle of radius 0.600m. The ball makes 2.00 revolutions in a second. What is its centripetal acceleration? (97.4 m/s?) 2. A 150-g ball at the end of a string is revolving uniformly in a horizontal circle of radius 0.600m. The ball makes 2.00 revolutions in a second. What is its centripetal acceleration? (2.78 x 10* g) 3. Suppose we had a ball on horizontal track on the ground and it has a mass of 1 kg and is moving at 2 m/s. The radius of the circular track is 20 cm. Draw an FBD for this situation. What is the normal force being exerted on the ball by the floor? What is the normal force being exerted on the ball by the track? (10 N, 20 N) 4. A 2 kg tetherball is moving in a circle of radius 1 m. The string makes an angle of 30 with the pole. What is the tension in the string? What is the speed of the ball? (23.09 N, 2.40 m/s)