The mass of the piston

Air is contained in a vertical piston-cylinder assembly. The atmosphere exerts a pressure of 14.7 psi on top of the 9-in-diameter piston. The absolute pressure of the air inside the cylinder is 16 psi. Determine the mass of the piston, in Ibm and gage pressure. The local acceleration of gravity D 40mm is 32.2 Ws'. (hint: Watch "pressure examples") ,C77,„,„1 65 mm il