the distance between 2 station is 5400 m find the time taken by a train to cover this distance, if the train travels with speed 60m/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.

Decreased sensitivity to an unchanging stimulus is known as

Convection occurs when thermal energy is transferred by the movement of