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A) Steel train rails are laid in 12.2m -long segments placed end to end. The rails are laid on a winter day when their temperature is -2.00 oC . How much space must be left between adjacent rails if they are just to touch on a summer day when their temperature is 33.0 oC? B) If the rails are mistakenly laid in contact with each other, what is the stress in them on a summer day when their temperature is 33.0 oC?

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