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A 7.5cmdiameter hole is drilled in a 10cmthick iron plate. If the plate temperature is 700 K and the surroundings are at 310 K, determine

A 7.5cmdiameter hole is drilled in a 10cmthick iron plate. If the plate temperature is 700 K and the surroundings are at 310 K, determine the energy loss through the hole. The hole sides may be considered to be black.

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