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A 1 km steel railroad rail is fastened securely at both ends when the temperature is...

A 1 km steel railroad rail is fastened securely at both ends when the temperature is 20 C. As the temperature increases, the rail begins to buckle. When the temperature is 25 C how high is the buckle assuming it is triangular in shape?

(The linear coefficient of expansion for steel is 11 X 10-6 K-1 )

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