PROBLEM $1\mathrm{.}2$

In Prob. $1\mathrm{.}1,$ knowing that $P=160kN,$ determine the average normal stress at the midsection of $($a$)$ rodAB,$(b)rodBC.$

PROBLEM $1\mathrm{.}1$ Two solid cylindrical rods $AB$ and $BC$ are welded together at $B$ and loaded as shown. Determine the magnitude of the force $P$ for which the tensile stress in rodAB is twice the magnitude of the compressive stress in rodBC.