Air at 1 atm and 20"C is flowing over the top surface of a 0.4-m-long thin flat plate. The air stream velocity is 49 m/'s and the plate is maintained at a constant surface temperature of 180"C. The properties of air (1 atm) at the 7r = (20 C + 180 Cy/2 =100*C are * = 0.03095 W/m . K. v =2.306* 10 5 m /s, and Pr = 0.7111. Air, T Determine the average friction coefficient. (You must provide an answer before moving on to the next part.) The average friction coefficient is 81.41