Take a$=900$mm and $\backslash$theta $=45\backslash$deg $.$

Take a$=25^(*)10^(-6)$K$^(-1),$E$=200$GPa, and A$=80$mm$^(2).$

Take P$=3$kN and R$=0\mathrm{.}4.$

$1.)$ Find the force in wire DB $($kN$).($ans: $1\mathrm{.}8091)$

$2.)$ Find the force in wire DC $($kN$).($ans: $4\mathrm{.}5228)$

$3.)$ Find the elongation of wire DC $($mm$).$

$4.)$ Find the displacement of point C $($mm$).$

$5.)$ Find the displacement of point B $($mm$).$

$6.)$ Find the elongation of wire DB $($mm$).$

$7.)$ Find the required temperature change of wire DB $($K$).$