Determine the change in length of a 20-m railroad track made of steel if the temperature is changed from -15C to +35C. (α= 1.1*10^(-5))

I just used for formula
ΔL = α(Li)ΔT

Lf = (1.1*10^-5)(20)(50) + 20
= 20.011m

did I do something wrong, the changes seems pretty negligible

Question

Determine the change in length of a 20-m railroad track made of steel if the temperature is changed from -15C to +35C. (α= 1.1*10^(-5))

I just used for formula
ΔL = α(Li)ΔT

Lf = (1.1*10^-5)(20)(50) + 20
= 20.011m

did I do something wrong, the changes seems pretty negligible

unklerhaukus · Answer

what are the units of $\alpha$?

australopithecus · Answer

they are given as /C lol

anonymous · Answer

Yes it is correct.The Change in lengths due to temperature a small bucause of the low coefficient of thermal expansion.

australopithecus · Answer

when you put it that way it makes sense thank you

anonymous · Answer

You're welcome.

unklerhaukus · Answer

good work