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A gas is compressed by a piston in a cylinder from an initial pressure of 10...

A gas is compressed by a piston in a cylinder from an initial pressure of 10 psia, initial volume at 40 ft^3 to a final pressure of 20 psia. During the compression process, the product pV remains constant. If the change in internal energy to the gas is 10 Btu, determine the amount of heat transferred from the system. (1 Btu = 778.17 ft-lbf)

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