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3. Rods of copper, brass, aluminum, and steel are welded together to form an X-shaped figure. Assum that the cross sectional area of each rod

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3. Rods of copper, brass, aluminum, and steel are welded together to form an X-shaped figure. Assum that the cross sectional area of each rod is the same. The end of the copper rod is maintained 120C. The end of the aluminum rod is at 100C and the ends of steel and brass rods are at 0C. Th lengths and thermal conductivities of the rods are: Copper: L=50cmk=0.92cal/scmC Brass: L=25cmk=0.26 Aluminum: L=60cmk=0.49 Steel : L=15cmk=0.12 Calculate the temperature at the junction

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