solid mechanics Rigid beam ABC is supported by rods $(1)$ and $(2)$ that have identical lengths of L$=7\mathrm{.}0$m$.$ Rod$(1)$ is made of steel $[$E$=200$ GPa$]$ and has a cross$-$sectional area of $175$mm $2.$ Rod $(2)$ is made of aluminum $[$E$=70$ GPa$]$ and has a cross$-$sectional area of $300$mm$.$ Assume dimensions of a$=1\mathrm{.}5$m and b$=3\mathrm{.}0$m$.$ For a uniformly distributed load of w$=15$ kN $/$ m$,$ determine the deflection of the rigid beam at point B$.$