A mass of 5kg of air expands in a polytropic process with n=1.2 from 300 kPa and 1.5m3 until double its volume. The air is then compressed in a process at a constant temperature until it returns to its initial volume. Determine: a) Boundary work and heat (in kJ) during the polytropic process (process 1-2) (b) Temperatures 1 and 2 c) Boundary and heat work for constant temperature compression process (2-3 process) For air you can use: R = 0.287 kJ/kg. K Cv = 0.718 kJ/kg. K Cp = 1,005 kJ/kg

Water, assumed to be a perfect liquid, has a density of 1000 kg/m³ and a specific heat of 4184 J/kgK. The water undergoes an adiabatic, frictionless process in which its pressure is raised from 100 kPa to 1000 kPa. Find the following: (a) the change of specific internal energy (J/kg) (b) the change in temperature (K) (c) the change of specific enthalpy (J/kg) (d) the temperature change (K) required in a non-adiabatic but isobaric process to change the enthalpy the same amount as the change in part c.

Water, assumed to be a perfect liquid, has a density of 1000 kg/m3 and a specific heatof 4184 J/kgK. The water undergoes an adiabatic, frictionless process in which itspressure is raised from 170 kPa to 850 kPa. Find the following:(a) the change of specific internal energy (J/kg)(b) the change in temperature (K)

A piston-cylinder assembly contains 22 kg of ammonia, initially at 80 kPa and -10°C. The ammonia is compressed to a pressure of 550 kPa. During the process, the pressure and specific volume are related by py- constant. Determine the work and the heat transfer, in kl. Step 1 Your answer is incorrect. Determine the work, in kl. Hint Save for Later Attempts: unlimited Submit Anwer Step 2 Your answer is incorrect. Determine the heat transter, in kd.