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A horizontal steel railroad track has a ...

A horizontal steel railroad track has a length of 100 m when the temperature is `25^(@)C`. The track is constrained from expanding or bending. The stress on the strack on a hot summer day, when the temperature is `40^(@)C`, is (Note : the linear coefficient of thermal expansion for steel is `1.1xx10^(-5)//.^(@)C` and the Young's modulus of steel is `2xx10^(11)` Pa)

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