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A gas contained in a vertical piston–cylinder assembly by a piston with a face area of...

A gas contained in a vertical piston–cylinder assembly by a piston with a face area of 40 in2 and weight of 100 lbf. The atmosphere exerts a pressure of 14.7 lbf/in2 on top of the piston. A paddle wheel transfers 3 Btu of energy to the gas during a process in which the elevation of the piston increases slowly by 4 ft. The piston and cylinder are poor thermal conductors, and friction between the piston and cylinder can be neglected.

Determine the change in internal energy of the gas, in Btu.

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