Physics

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When railroad tracks are installed, gaps are left between the rails. Each steel rail is 8.0m long and has a cross-sectional area of 0.0020m^2. On a hot day, each rail thermally expands as much as 4.0mm. If there were no gaps between the rails, what would be the force on the ends of each rail?
[Y=20x10^10 N/m^2]

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