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What is the emissivity of a substance that radiates heat at a rate of 120 joules/second. The object has a surface temperature of 31.0 Celsius

What is the emissivity of a substance that radiates heat at a rate of 120 joules/second. The object has a surface temperature of 31.0 Celsius and the surrounding air temperature is 18.0 Celsius. The surface area of this object is 2.10 square meters

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