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At what net rate (in kW) does heat radiate from a 280 m2 black roof on...

At what net rate (in kW) does heat radiate from a 280 m2 black roof on a night when the roof's temperature is 31.0°C and the surrounding temperature is 17.0°C? The emissivity of the roof is 0.900. (Enter the magnitude.)

___________kW

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