In Figure P12.21, bat AB is pinned at A. It can be considered rigid and weightless. The al...

In Figure P12.21, bat AB is pinned at A. It can be considered rigid and weightless. The aluminum (E = 72.0 GPa) columns CD and FH have solid circular cross sections of diameter 100 mm. Column CD has pinned ends, and column FH is clamped at the bottom and pinned at the top. When the load Q = 0, bar AB is horizontal, and the two columns are just in contact with AB. Determine the least value of Q that will cause one of the columns to buckle.

FIGURE P12.21