A 2-m-long pin-ended column of square cross section is to be constructed...

A 2-m-long pin-ended column of square cross section is to be constructed of timber for which E = 11 GPa and = 15 MPa for compression parallel to the grain. Using a factor of safety of 2 in computing Euler’s buckling load, determine the size of the cross section if the column is to safely support (a) a 100-kN load and (b) a 200-kN load