6. A black wood stove with surface area 4.6 m is made from cast iron 4.0 mm thick. Its interior wall is at 650 C, while the exterior is at 647 .C. How much heat the stove loses every second by a combination of conduction and convection in the surrounding air. The thermal conductivity of cast iron is 80.4 W/m.K. Hint: First find the rate of heat conduction through the stove wall, then the rate of heat loss by radiation from the outer surface of the stove. The difference is what is transferred to the air by convection and conduction