An impatient motorist considers speeding as he travels between two cities. If the trip normally takes 2.8h at an average speed of 100.0km/h, how much time will be saved if he exceeds the speed limit by 10.0km/h

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.