A12m rectangular column has a cross section that is 20cm tall and 10cm wide. assume these line up with the standard y and x axis, respectively. the column is fixed at the bottom and pinned at the top. additionally, a pin is attached halfway up the column that restricts movement in the x direction. what is the buckling stress that will cause the column to fail and what are the slenderness ratios associated with column? assume the material is a36 steel. (hint: think of how the pin in the middle of the column affects the length in the associated direction and what are the supports for each condition? )