At cruise conditions, air flows into a jet engine at a steady rate of 65 lbm / s 65 lbm/s. Fuel enters the engine at a steady rate of 0.60 lbm / s 0.60 lbm/s. The average velocity of the exhaust gases is 1500 ft / s 1500 ft/s relative to the engine. If the engine exhaust effective cross‐sectional area is 3.5 ft 2 3.5 ft2, estimate the density of the exhaust gases in lbm / ft 3 lbm/ft3.

A2-m rigid tank initially contains saturated water vapor at 100 kpa. the tank is connected to a supply line through a valve. steam is flowing in the supply line at 600 kpa and 300 c. the valve is opened, and steam is allowed to enter the tank until the pressure in the tank reaches the line pressure, at which point the valve is closed. a thermometer placed in the tank indicates that the temperature at the final state is 200°c. determine (a) the mass of steam that has entered the tank (b) the amount of heat transfer.