https://dl.dropbox.com/u/73421703/b1.jpg [Broken] hi there , i'm asking for help with this one! I should solve that problam through energy method. Given single force Q(not shown in the picture) on the edge of the cantilever(the right-end of the beam), what i'm looking for - The critical P(axial force) that beam can absorb. the answer is in Euler form. any suggestions would help! p.s sorry for the poor english.