2 Consider the 5-m x 5-m x 5-m cubical fumace shown in Figure Que. 2, whose surfaces closely approximate black surfaces. The base, top, and side surfaces of the furnace are maintained at uniform temperatures of 800 K, 1500 K, and 500 K, respectively. Determine (a) the net rate of radiation heat transfer between the base and the side surfaces, (b) the net rate of radiation heat transfer between the base and the top surface, and (c) the net radiation heat transfer from the base surface. T₂-1500 K Fig. Que. 2 T₁-800 K T₁-500 K