Dry, compressed air at Tₘ,ᵢ =55°C, p = 15 atm, with a mass flow rate of n = 0.09 kg/s, enters a 50-mm-diameter, 2.5-m-long tube whose surface temperature is Tₛ =25°C. Determine the mean temperature of the air at the tube outlet, in K, the rate of heat transfer from the air to the tube wall, in W, and the power required to flow the air through the tube, in W.