Two horizontal $5-$kip forces are applied to pin $B.$ All three pins at joints $A,B,$ and $C$ have diameters of $0\mathrm{.}8$ in $.$ Determine $(A)$ the axial forces on members $AB$ and $BC,(B)$ the maximum normal stress on member $AB$ and $BC,$ and $(C)$ the factor of safety against shear failure of pin A assuming it is made of steel with an ultimate shearing stress of $50$ ksi $.$ Denote tensile forces and stresses as positive values and compressive forces and stresses as negative values. Ans. Part B ${}_{AB}=+14\mathrm{.}6$ksi