Question: A vertical square plate, 30 cm on a side, is maintained at 50C and exposed to room air at 20C. The surface emissivity is 0.8.

A vertical square plate, 30 cm on a side, is maintained at 50ºC and exposed to room air at 20ºC. The surface emissivity is 0.8. Calculate the total heat lost by both sides of the plate.

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