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A small sphere (emissivity = 0.90, radius = r2) is located at the center of a spherical asbestos shell (thickness = 1.0 cm, outer radius =r2) The thickness of the shell is small compared to the inner and outer radii of the shell. The temperature of the small sphere i 800.0 C, while the temperature of the inner surface of the shell is 600.0 C. Both temperature remain constant. Assuming that r2/r1= 10.0 and ignoring any air inside the shell, find the temperature of the outer surface of the shell."

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