An aluminum tube AB with a circular crosssection has a sliding support at the base and is pinnedat the top to a horizontal beam supporting a loadQ = 200 kN (see figure).Determine the required...

An aluminum tube AB with a circular cross
section has a sliding support at the base and is pinned
at the top to a horizontal beam supporting a load
Q = 200 kN (see figure).
Determine the required thickness t of the tube if
its outside diameter d is 200 mm and the desired factor
of safety with respect to Euler buckling is n = 3.0.
(Assume E = 72 GPa.)