A rifle with a weight of 40 N fires a 5.1-g bullet with a speed of 290 m/s. (a) Find the recoil speed of the rifle. m/s (b) If a 725-N man holds the rifle firmly against his shoulder, find the recoil speed of the man and rifle. m/s

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