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4. (20 points) A tank contains air at a temperature of 30C and the absolute pressure of 670kPa at the instant. If the tank nozzle

4. (20 points) A tank contains air at a temperature of 30C and the absolute pressure of 670kPa at the instant. If the tank nozzle releasing the air at 0.8m3/s, and the volume of the tank is 20m3, determine the rate of change in the density of the air within the tank at this instant. Is the flow steady or unsteady

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