Re: Way Cool...
Energy per unit mass is about 10x better than a fly wheel, similar to ANFO (cheap explosive) and about one tenth of body fat. (Assumed: two spheres with 75nm radius and density 2500kg/m3. Energy=34pJ, Energy density 3.9MJ/kg)
If all the energy went into heating the dumbbells then the temperature would rise about 5500K. This is well over the melting point but I could not find the latent heat of fusion (or vaporisation). Each of those steps would reduce the final temperature but it certainly looks like a collision would break up the dumbbells into really tiny pieces.
Biting the hand that feeds IT
