In Figure P12.9, member 0A can be considered rigid and weightless. Columns BC and DF are p...

In Figure P12.9, member 0A can be considered rigid and weightless. Columns BC and DF are pin-ended with solid circular cross sections of diameter 10.0 mm. Column BC is made of structural steel (E = 200 GPa) and column DF is made of an aluminum alloy (E = 72.0 GPa). Determine the magnitude of Q that will first cause one of the columns to buckle.

FIGURE P12.9