Two solid cylindrical rods $AB$ and $BC$ are welded together at $B$ and loaded. The

average normal stress must not exceed $175$ MPa in rod $AB.$ Assume that $F1=30kN,$

$F2=40kN.$ Given that, $d1=120mm,$ find the factor of safety associated with the

average normal stress of rodAB.

Hint: Initially, you need to identify the actual normal stress in rod $AB.$