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Statement of a problem № 2671

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A copper rod (a = 1.70 x 10^-5 °C-1) is 20 cm longer than an aluminum rod (a = 2.20 x 10-5 °C-1). How long should the copper rod be if the difference in their lengths is to be independent of temperature?

Solution:
A copper rod (a = 1.70 x 10^-5 °C-1) is 20 cm longer than an aluminum rod (a =

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