1. what is heat? a) a measurement of how fast the molecules of an object are moving. b) the energy contained within an object because of its moving molecules. c) the amount of heat needed to raise the temperature of a substance 1°c

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.