A horizontal rope is tied to a 50 kg box on frictionless ice. What is the tension in the rope if a. The box is at rest?
b. The box moves at a steady 5.0 m/s?
c. The box has v_x = 5.0 m/s and a_x = 5.0 m/s^2?

An athlete swings a ball, connected to the end of a chain, in a horizontal circle. the athlete is able to rotate the ball at the rate of 8.13 rev/s when the length of the chain is 0.600 m. when he increases the length to 0.900 m, he is able to rotate the ball only 6.04 rev/s. (a) which rate of rotation gives the greater speed for the ball? 6.04 rev/s 8.13 rev/s (b) what is the centripetal acceleration of the ball at 8.13 rev/s? m/s2 (c) what is the centripetal acceleration at 6.04 rev/s? m/s2