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How much power is radiated by a tungsten sphere (emissivity ϵ = 0.35) of radius 17...

How much power is radiated by a tungsten sphere (emissivity ϵ = 0.35) of radius 17 cm at a temperature of 18 ∘C? If the sphere is enclosed in a room whose walls are kept at -5 ∘C, what is the net flow rate of energy out of the sphere?

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