Two rooms, each a cube 4.0 m per side, share a 14-cmthick

Chapter 14, Problem 41

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Two rooms, each a cube 4.0 m per side, share a 14-cmthick brick wall. Because of a number of 100- W lightbulbs in one room, the air is at 30C, while in the other room it is at 10C. How many of the 100- W bulbs are needed to maintain the temperature difference across the wall?

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