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Consider coaxial, parallel, black disks separated a distance of L=0.20m. The lower disk of diameter D2=0.40m is maintained at T2=400K and the surroundings are at

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Consider coaxial, parallel, black disks separated a distance of L=0.20m. The lower disk of diameter D2=0.40m is maintained at T2=400K and the surroundings are at Tiar=310K. What temperature, in K, will the upper disk of diameter D1=0.20m achieve if electrical power of 15W is supplied to the heater on the back side of the disk

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