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## Homework Statement

""If the coefficient of thermal expansion of steel is 1.1 x 10^ -5 ℃^ -1 and a railway rail is 4. 5 m long, how much would the length Δ L of the rail increase by if the temperature changes from -10 ℃ to 30 ℃? ""

Could anyone direct me to a youtube video, or something that could help understand how to work this out and get the answer.

## Homework Equations

Im not sure

## The Attempt at a Solution

Not sure. Please and thank you for your help.