A gas undergoes a cycle in a piston-cylinder assembly consisting of the following three processes: Process 1-2: Constant pressure, p = 1.4 bar, V₁ = 0.028 m³, W12 = 10 kJ Process 2-3: Compression with pV = constant, U3 = U₂ Process 3-1: Constant volume, U₁ - U3 = -25 kJ There are no significant changes in kinetic or potential energy. (a) Calculate the net work for the cycle, in kJ. (b) Calculate the heat transfer for process 1-2, in kJ. Part A Your answer is correct. Calculate the net work for the cycle, in kJ. Wcycle = -7.63 kJ

A closed system consisting of 10 lb of air undergoes a polytropic process from p₁ = 65 lbf/in², v₁ = 4 ft³/lb to a final state where p₂ = 20 lbf/in², v₂ = 11 ft³/lb. Determine the polytropic exponent, n, and the amount of energy transfer by work, in Btu, for the process. Step 1 Your answer is correct. Determine the polytropic exponent, n, for the process. n = 1.16 Hint Step 2 Your answer is incorrect. Determine the amount of energy transfer by work, in Btu, for the process. W = i 462.623 Btu Toutbo dlo Attempts: 1 of 4 used

Refrigerant 134a expands in a piston-cylinder assembly from p₁ = 140 lb/in² and T₁ = 140°F to p₂ = 30 lb/in² and T₂ = 80°F. The mass of refrigerant is 0.44 lb. During the process, the work done by the refrigerant is 4.32 Btu. Kinetic and potential energy effects are negligible. Determine the initial volume of the refrigerant, V₁, in ft³, and the heat transfer for the process, in Btu.

The energy equation contains the following term(s): O pressure term (expansion/compression work) O velocity term (kinetic energy) elevation term (potential energy) all of the above