Three pinned-end columns each have a cross-sectional area of 2000 mm2 and length of 750 mm. They are made of 7075-T5 aluminum alloy (E = 72.0 GPa and σPL = 448 MPa). One of the columns has a solid square cross section. A second column has a solid circular cross section. The third has a hollow circular cross section with an inside diameter of 30.0 mm. Determine the critical buckling load for each of the columns.
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