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A 15 cm x 20 cm circuit board is being cooled by forced convection of air at 1 atm. The heat from the circuit board is estimated to be 1000 W/m^2. If the air stream velocity is 3 m/s and the shear stress of the circuit board surface is 0.075 N/m^2, determine the temperature difference between the circuit board surface temperature and the airstream temperature. Evaluate the fluid properties at 40 C.