Each bar has a 500-mm 2 cross-sectional area and modulus of elasticity E = 72 GPa. If you don’t want

Each bar has a 500_mm2 cross-sectional area
and modulus of elasticity E = 72 GPa. If you don’t want to subject the
bars to a tensile stress greater than 270 MPa, what is the largest downward
force that be applied at A?