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(a) How much power is radiated by a tungsten sphere (emissivity e = 0.35) of radius 20 cm at a temperature of 28°C

(a) How much power is radiated by a tungsten sphere (emissivity e = 0.35) of radius 20 cm at a temperature of 28°C?
W
(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?
W
i need the answer in watts, i would like the equation and steps to solving the problem
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