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Q: A stereo receiver/amplifier is enclosed in a thin metallic case for which the top, horizontal surface is 0.5 m x 0.5 m on a side. The surface, which is not vented, has an emissivity of e = 0.8 and is exposed to quiescent ambient air and large surroundings for which T8 = Tsur = 25°C. For surface temperatures in the range 50 < ts="">< 75?c,="" compute="" and="" plot="" the="" total="" heat="" rate="" from="" the="" surface,="" as="" well="" as="" the="" contributions="" due="" to="" convection="" and="" radiation.="">