A 38kg child is at the top of a slide that is 2.1m tall (a) If there is no friction , how fast will they be moving when they reach the bottom of the slide ? (b) they lose 250.0J of energy to sound, heat, and friction, how fast will they be moving when they reach the bottom?

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