A metallic airfoil of elliptical cross section has a mass of 320 kg, surface area of 12 m2, and a specific heat of 0.50

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A metallic airfoil of elliptical cross section has a mass of 320kg, surface area of 12 m2, and a specific heat of 0.50kJ/kg·K. The airfoil is subjected to air flow at 1 atm, 25°C, and 5m/s along its 3-m-long side. The averagetemperature of the airfoil is observed to drop from 160°C to 150°Cwithin 1 min of cooling. Assuming the surfacetemperature of the airfoil to be equal to its average temperature,determine the rate of heat transfer and the averageheat transfer coefficient. Determine the average frictioncoefficient of the airfoil surface, if the average heattransfercoefficient is 16.0256 W/m2-°C.