To keep her dog from running away while she talks to a friend, susan pulls gently on the dog's leash with a constant force given by f⃗ = (2.3 n )x^ + (1.2 n )y^. part a how much work does she do on the dog if its displacement is d⃗ = (0.34 m )x^,

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