A piston-cylinder assembly contains 0.5 lb of air initially at a pressure of 30 lb/in² and a temperature of 400°F. The air is heated at constant pressure until its volume is doubled. Assume the ideal gas model with constant specific heat ratio, k = 1.4. Determine the work and heat transfer, in Btu. Step 1 Determine the work, in Btu. W12= i Btu

A piston-cylinder assembly contains 2 lb of water, initially at 100 lbf/in.² and 400°F. The water undergoes two processes in series: a constant-pressure process followed by a constant volume process. At the end of the constant-volume process, the temperature is 300°F and the water is a two-phase liquid-vapor mixture with a quality of 60%. Neglect kinetic and potential energy effects. Determine the work and heat transfer for each process, all in Btu. Part A * Your answer is incorrect. Determine the work for the constant-pressure process, in Btu. W12= 38.65 Btu

A piston-cylinder assembly contains ammonia, initially at a temperature of -20°C and a quality of 80%. The ammonia is slowly heated to a final state where the pressure is 6 bar and the temperature is 180°C. While the ammonia is heated, its pressure varies linearly with specific volume. For the ammonia, determine the work and heat transfer, each in kJ/kg. W/m = -56.155 Q/m = 466.851 x kJ/kg x kJ/kg

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