A gas is confined by a piston, 10 cm in diamater, on which rests a weight. The mass of the piston and weight together is 30 kg. The local acc of gravity is 9.81 m/s^2, and the atmospheric pressure is 101.22 kPa.
a) What is the force in newtons exerted on the gas by the atmosphere, the piston, and the weight, assuming no friction between piston and cylinder.
b) What is the pressure of the gas in kPa?
c) If the gas in the cylinder is heated, it expands, pushing the piston and weight upward. If the piston and weight are raised 40 cm, what is the work done by the gas in kJ? What is the change in potential energy of the piston and weight?