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A copper rod is 0.4m long at 0C.Calculate the length ofa zinc rod at0C if...

A copper rod is 0.4m long at 0C.Calculate the length ofa zinc rod at0C if the difference between the lengths of the two rods is to remain the same at all temperatures.(linear expansitivity of copper=1.7x10^-5 K^-1,and linear ofzinc=3.0x10^-5 K^-1)please I need the workings for better understanding?
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