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A piston cylinder contains 2 lbm of air and operates at a constant pressure of 400...

A piston cylinder contains 2 lbm of air and operates at a constant pressure of 400 psia. The initial volume is 1 ft.3 and the initial temperature is 100°F. The final volume is 4 ft.3 and the final temperature is 1780°F. Determine the work and its direction (in or out) and the heat transfer and its direction, in Btu/lbm.

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