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a) How much power is radiated by a tungsten sphere (emissivitye=0.35) of radius 20 cm at...

a) How much power is radiated by a tungsten sphere (emissivitye=0.35) of radius 20 cm at a temperature of 20 ∘ C ? Express your answer using two significant figures.

b) 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? Express your answer using two significant figures.

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