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physic

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An aluminum rod is 10.0 cm long and a steel rod is 80.0 cm long when both rods are at a temperature of15 degrees cel. Both rods have the same diameter. The rods are joined end-to-end to form a rod 90.0 cm long. The coefficients of linear expansion of aluminum and steel are2.4x10^-5k^-1 and1.2x10^-5k^-1 respectively. The temperature is raised to90degrees cel. The increase in the length of the joined rod, in mm,

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