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30 Two steel rods and an aluminium rod of equal length l and equal cross...

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30 Two steel rods and an aluminium rod of equal length l and equal cross section are joined rigidly at their ends as shown in the figure below All the rods are in a state of zero tension at 0 C Find the length of the system when the temperature is raised to 0 Coefficient of linear expansion of aluminium and steel area and a respectively Young s modulus of aluminium is Y and of steel is Y Steel 1390 Aluminium Steel O

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