A ball in a roulette wheel makes 85 revolutions in 45.0 s before failing. If the radius of the wheel is 57.5 cm, what is the average centripetal acceleration of the ball? Write your answer in meters per second and show all work.

A1-lb collar is attached to a spring and slides without friction along a circular rod in a vertical plane. the spring has an undeformed length of 5 in. and a constant k =25 lb/ft. knowing that the collar is released from being held at a determine, the speed of the collar and the normal force between the collar and the rod as the collar passes through b.