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A sphere of radius 0.500 m, temperature 25.5°C, and emissivity 0.819 is isolated in an environment of temperature 77.0°C. (a)
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The rate at which the sphere emit thermal radiation is, Pemitted = A$oTº = 4gr EoTº = 41 (0.50 m)? (0.819)(5.6704x10-8W/m²K4)

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