The pipe rigidly fixed between two supports is made of A$-36$ steel

and has $A=322m{m}^2.$

Determine the $$ in the pipe when it is subjected to a temperature

variation of $T=(1200-x)C$; $x$ in $mm.$

For A$-36$ steel, $E=200{10}^3$MPa,$=12\frac{{10}^{-6}}{}C$