For an Intro engineering class we've working on a project to make bridges out of spaghetti. To determine if the different spaghetti components of my bridge are strong enough to hold the force that's being applied on them, Ive been trying to calculate the spaghetti's critical buckling load for the components in the bridge under compression. Im getting real whacky numbers when Ive been trying to calculate these forces. They arent matching up any where close to the compression strengths Ive measured in the lab. Alright so the equation I need to solve this is F = (pi^2)*(E)*(I)/(L^2), or Euler's buckling Load formula. E = young's modulus of elasticity, I = cross section moment of inertia, which Ive been told is = pi*(R^4)4 (R is radius). E for spaghetti is somewhere around 5 gigaPascals. Anyways, picking out one example from the data Ive collected I have a 10 cm long piece of past with a radius of .1 cm. The amount of force recorded when the spaghetti started to buckle during testing was 2.25 newtons, so I should get around this force when I use Euler's buckling formula right? Attempt -------- Ok so converting all measurement to meters I plug in F = [ (pi^2)*5*(pi*(.001m^4)/4) ] / .1 cm ^2. I work this out and get F = 3.87*10^-9 newtons....what am I doing wrong?