posted by Thao .
A gas is confined in a 0.47-m-diameter cylinder by a piston, on which rests a weight. The mass of the piston and weight together is 150 kg. The atmospheric pressure is 101 kPa. (a)What is the force (in Nt) exerted on the gas by the piston, the weight and the atmosphere combined? Neglect friction between the piston and cylinder.
(b) If the friction was not negligible, would the force in part (a) be smaller or larger. Explain.