${}_1=16*{10}^{-6}$

$\frac{1}{C}$

${}_2=12*{10}^{-6}\frac{1}{C}$

$E_1=100$GPa

$E_2=200$GPa

${}_{em,1}=100$MPa

${}_{em,2}=150$MPa

Boy Kesit

In the figure given, a circular cross$-$section rod with a diameter of $4cm,$

made of material number $1,$ is placed inside the pipe produced from

material number $2.$ The entire system is mounted on a rigid plate from

below and on a fixed wall from above. The temperature when the system

is installed is $10C.$ How much should the temperature be changed to

close the $0\mathrm{.}0Kcm$ gap?