A gas compressed at a constant pressure of 0.8atm from 9L to 2L, in the process 400J of energy leaves the gas by heat. what is the work done by the gas?

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.

What are the north and south poles of a solenoid change with?

An element becomes a positively charged ion when itloses protons.loses electrons.gains electrons.gains neutrons.