A circular plate of 500-mm diameter is maintained at T1 = 600 K and is positioned coaxial to a conical shape. The back side of the cone is well insulated. The plate and the cone, whose surfaces are black, are located in a large, evacuated enclosure whose walls are at 300 K. (a) What is the temperature of the conical surface, T2? (b) What is the electrical power that would be required to maintain the circular plate at 600K?