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Unformatted text preview: 4. Air goes through a polytropic process from 125 kPa, 325 K to 300 kPa and 500 K. Find the polytropic exponent n and the specific work in the process. 5. A cylinder containing 1 kg of ammonia has an externally loaded piston. Initially the ammonia is at 2 MPa, 180 ° C and is now cooled to saturated vapor at 40 ° C, and then further cooled to 20 ° C, at which point the quality is 50%. Find the total work for the process, assuming a piecewise linear variation of P versus V . 6. A pot of steel, conductivity 50 W/m K, with a 5 mm thick bottom is filled with 15 ° C liquid water. The pot has a diameter of 20 cm and is now placed on an electric stove that delivers 250 W as heat transfer. Find the temperature on the outer pot bottom surface assuming the inner surface is at 15 ° C....
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 Fall '04
 Felicelli
 Thermodynamics, Heat, pressure piston cylinder

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