A circulur column has a diameter of 80mm outside edge and 60mm inside edge.

Both ends are fixed with equal force being applied top and bottom.

Young's Modulus E = 200GN m-^{2}

Yield Stress deltay = 140 MN m-^{2}

What is the minimum length of column at which buckling is likely to happen?

If the column was this length what load would you expect failure to occur?

If the column is half this length what load would you expect failure to occur?

Really struggling with this one if anyone can help id really appreciate it