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A horizontal 3-mm-thick flat copper plate. 1 m long and 0.5 m wide, is exposed in air at 270 C  to radiation from the sun. If the total rate of incident solar radiation is 300W and the combined unit-surface Conductance’s on the upper and lower surfaces are 20 and 15 W/m2K, respectively, determine the equilibrium temperature of the plate.

                                                                                      

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