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example 4-2 - Example 4-2 Air with an initial temperature...

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Example 4-2 Air with an initial temperature of 60°F and 14.7 psia is compressed adiabatically and quasi-statically in a piston- cylinder assembly. The mass of air is 0.066 lbm. If 1470 ft·lbf of work is done on the gas, find the final temperature and pressure. Assume constant specific heats at 60°F. Solution: From the first law U Q W = Since the process is adiabatic W U = −∆ ( ) 2 1 v W mc T T = − Btu CV(air, 60) 0.172 lbm R v c T = = = 2 1 v W T T mc = ( ) ( ) o 2 1Btu 1470ft lbf 778ft lbf 60 F Btu 0.0661 lbm 0.172 lbm R T = o 2 227 F T = To find the final pressure, note that this is an adiabatic,
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