In a game of pool, a 0. 4 kg cue ball is traveling at 0. 80 m/s when it hits a slower striped ball moving at 0. 38 m/s. After the collision, the striped ball moves off at 0. 62 m/s. What is the magnitude of the final velocity of the cue ball? Assume all pool balls have the same mass. 0. 20 m/s 0. 56 m/s 1. 0 m/s 1. 8 m/s.

At 20∘c, the hole in an aluminum ring is 2.800 cm in diameter. you need to slip this ring over a steel shaft that has a room-temperature diameter of 2.804 cm . 1. to what common temperature should the ring and the shaft be heated so that the ring will just fit onto the shaft? coefficients of linear thermal expansion of steel and aluminum are 12×10−6 k−1 and23×10−6 k−1 respectively.