Problem 1: a small disk 5 mm in diameter is positioned and the center of an isothermal hemispherical enclosure aperture the disk is at 900 k, and has a diffuse gray surface with an emissivity of 0.7. the hemispherical adiabatic enclosure has a radius of r 100 mm and an emissivity 450 of 0.85. the enclosure has a small aperture of 2mm diameter. by radiative network analysis, determine the radiant power leaving the enclosure through the aperture outside the aperture the environment is at 300 k. (let the disk be surface 1, the hemispherical enclosure is surface 2, and the aperture be surface 3)