Compressed air enters a 0.2 m diameter circular air duct at a temperature of 20°C and a pressure of 200 kPa at a speed of 5 m/s. The air heats up during the flow and leaves the pipe (duct) at a temperature of 60°C and a pressure of 180 kPa. a) Mass flow rate of air ? b) The power of the heater used c) The outlet velocity of the air

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