1. The problem statement, all variables and given/known data A dilute solution of macromolecules at temperature T is placed in an untracentrifuge rotating with angular velocity w. The centripetal acceleration w2r acting on a particle of mass m may then be replaced by an equivalent centrifuge force mw2r in the rotating frame of reference. a) Find how the relative density [tex]\rho[/tex](r) of molecules varies with their radial distance r from the axis of rotation. b) Show quantitatively how the molecular weight of the macromolecules can be determined if the density ratio [tex]\rho1[/tex] / [tex]\rho2[/tex]at the radii r1 and r2 is measured by optical means. 2. Relevant equations F = mv2/r density = mass /volume 3. The attempt at a solution I do not know how to even start the problem. Please help.