A piston-cylinder device is filled to 1 m3 with 0.6 kg of argon at 27 °C. The piston moves by changing its loads, until the volume is twice its initial magnitude. During this process, the argon temperature remains constant. Calculate the final pressure on the device.

Air enters a horizontal, constant-diameter heating duct operating at steady state at 290 k, 1 bar, with a volumetric flow rate of 0.25 m°/s, and exits at 325 k, 0.95 bar. the flow area is 0.04 m2. assuming the ideal gas model with k = 1.4 for the air, determine (a) the velocity at the inlet and exit, each in m/s, and (c) the rate of heat transfer, in kw flow rate, in kg/s, (b) the mass kg 0.3