A 35-ft3 rigid tank has air at 225 psia and ambient 600 R connected by a valve to a piston/cylinder. The piston of area 1 ft² requires 40 psia below it to float (see Fig. P2.166E). The valve is opened, the piston moves slowly 7 ft up, and the valve is closed. During the process, air temperature remains at 600 R. What is the final pressure in the tank?

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g Cylinder B Tank A Piston Valve