A steel radiant tube, that is 8 inches in diameter and 8 feet long, is placed inside of a convective oven. An electric element inside of the tube produces 33 kw of energy. If 5000 ft3/minute of air, at 500oC, is passed over the tube (flowing perpendicular to the length of the tube). What will be the surface temperature of the tube and the temperature of the air after passing over the tube?