An internal energy of a solid when the heat is transferred to it from the surrounding. A 1kg of copper is heated at atmospheric pressure. if its temperature increases from 20⁰c to 50⁰c find the work done by copper

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.