How much power is radiated by a tungsten sphere $($emissivity $lon=0\mathrm{.}35)$ of radius $20$ cm at a temperature of $26C?$ Express your answer to two significant figures and include the appropriate units.

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Part B

If the sphere is enclosed in a room whose walls are kept at $-5C,$ what is the net flow rate of energy out of the sphere? Express your answer to two significant figures and include the appropriate units.

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