Air enters a combustion chamber at a velocity of 100 m/s, a pressure of 90 kPa, and a temperature of 40°C. As a result of the combustion, heat is added to the air at a rate of 500 kJ/kg. Find the exit velocity and Mach number. Also, find the heat addition that would be required to choke the flow. Neglect the effects of friction and assume that the properties of the gas in the combustion chamber are the same as those of air

On a average work day more than work place firs are reorted

Steel balls 12 mm in diameter are annealed by heating to 1150 k and then slowly cooled to 400 k in an air att 325 k and h -20 w/m2 k. assume the properties of the steel to be k- 40 w/m k,p 7800 kg/m3, and cp 600 j/kg k. a. determine whether lumped system method can be used to analyze this problem and if so why" b. determine the time required for the cooling process. c. determine the total amount of heat lost from each ball to the ambient air

An electrical kettle is made out of stainless steel,weighs two pounds (when empty) with a heating element that consumes 2 kw of electricity. assuming that the water and the kettle are at the same uniform temperature at any moment of time, calculate the shortest possible time to bring 2 quarts of water from room temperature to the onset of boiling.