Agas is confined initially to a volume vi in a horizontal cylinder by a frictionless piston held in place by latches. when the piston is released, it is forced outward by the internal pressure of the gas acting on the interior piston face. a constant external pressure p acts on the external piston face and resists the motion of the piston. a) state how to calculate the work of the system –taken as the piston, cylinder, and the gas, as the gas expands to a final volume vf such that the piston is in an equilibrium position with the gas pressure equal to the external pressure, p. b) compute the work if the external pressure is 140 kpa and the change of volume is 0.01 cm?