Heat transfer from the roof of a rail car. the top surface of the passenger car of a train moving at a velocity of 95 km/h is 2.8 m wide and 8 m long. the top surface is absorbing solar radiation at a rate of 380 w/m2 and the ambient air temperature is 30°c. assuming the car roof to be perfectly insulated and the radiation heat exchange with the surroundings to be small relative to convection, determine the temperature of the top surface of the car. hint: treat the top surface as a flat plate in determining the film coefficient h. 37.1°c