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8. A cube of unknown material has sides of length 10.0 cm and a temperature of...

8. A cube of unknown material has sides of length 10.0 cm and a temperature of 70.0◦C. Treat this object as a perfect emitter. (a) At what rate does the object radiate heat? (b) If the object is placed inside a room at room temperature, 22◦C, what is the net rate of heat radiation of the object with its surroundings?

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