Question: A blackened, solid copper sphere of radius 4.0 cm hangs in a vacuum in an enclosure whose walls have a temperature of 20 o C.

A blackened, solid copper sphere of radius 4.0 cm hangs in a vacuum in an enclosure whose walls have a temperature of 20^oC. If the sphere is initially at 0^oC, find the rate at which its temperature changes, assuming that heat is transferred by radiation only.

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