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The temperature difference between two opposite sides of a solid brass box is 50 C, and the area of either side is 10 cm.

The temperature difference between two opposite sides of a solid brass box is 50 C, and the area of either side is 10 cm. If the distance between these parallel sides is 5 cm, and the thermal conductivity (K) of brass is 120 J/(s m "C), what is the rate of heat transfer from one side to the other per second?

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