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3. Ait with a mass of 4.1lbm at 30psia and 65F contained in a piston-cylinder device is compressed to a final pressure of 90psia. The

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3. Ait with a mass of 4.1lbm at 30psia and 65F contained in a piston-cylinder device is compressed to a final pressure of 90psia. The compression is a polytropic process which follows the relationship Pl=C with n=1,6. Determine a. the final volume of the air (ft3), and b. the work for the process (Btu)

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