posted by Mitch .
A steel section of the Alaskan pipeline had a length of 65 m and a temperature of 16°C when it was installed. What is its change in length when the temperature drops to a frigid -39°C?
The pipe shortens. That is a -55 C temperature change.
length change =
-(65 m)*(thermal expansion coefficient of steel)* (55 C)
Look up the thermal expansion coefficient of steel for that temperature range. It is about 12*10^-6 per degree C