an aluminum rod is 10cm long and a steel rod is 80cm long when both rods are at 15 degrees C. Both rods have the same diameter. these rods are joined end to end to form a rod 90cm long. the coefficient of linear expansion of aluminum and steel are 2.4 x 10^-5 K^-1 and 1.2 x 10^-5 K^-1. the temperature is raised to 90 degreesC. the increase in the length of the joined rod, in mm, is closest  to? - 0.9 -0.81 - 0.72 - 0.63 - 0.99

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