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A 1-in. thick steel plate measuring 10 in. in diameter is heated from below by a hot plate, its upper surface exposed to air at 80oF. The heat-transfer coefficient on the upper surface is 5 Btu/h ftoF and k for steel is 25 Btu/h ftoF.

a.) How much heat must be supplied to the lower surface of the steel if its upper surface remains at 160oF? (include radiation)

b.) What are the relative amounts of energy dissipted from the upper surface of the steel by convection and radiation?

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