A furance is shaped like a long equilateral triangular duct. The width of each side is 1 m. The base surface has an emissivity of 0.7 and is maintained at a uniform temperature of 600 K. The heated...

A furance is shaped like a long equilateral triangular duct. The width of each side is 1 m. The base surface has an emissivity of 0.7 and is maintained at a uniform temperature of 600 K. The heated left side surface closely approximates a black body at 1000 K. The right-side surface is well-insulated. Determine the rate at which energy must be supplied to the heated side externally per unit length of the duct.