The air in an engine cylinder at the beginning of the compression stroke is at atmospheric pressure of 1.02 bar, and a temperature of 27°C. The swept volume of the engine cylinder is 440cm3 and the clearance volume is 55cm3. If the temperature of the air in the cylinder is 90°C at the end of the compression stroke, calculate the gauge pressure of this air.

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