1. The problem statement, all variables and given/known data A sample of blood is placed in a centrifuge of radius 15.7 cm. The mass of a red corpuscle is 3.09×10-16 kg, and the magnitude of the force required to make it settle out of the plasma is 4.01×10-11 N. At how many revolutions per second should the centrifuge be operated? 2. Relevant equations Fc = mv2/r 3. The attempt at a solution Well I am not sure if the above equation actually helps with this question, but the equation can be rearranged to suit the values: v = (Fc x r/m)^.5 From using this equation I can obtain the velocity which is 1427.39 m/s. My question is whether I am looking at this question with the completely wrong formula or am I on the right track? If I am on the right track, what would I go about doing next? I can't recall any ways of determining revolutions per second from velocity... Any help would be most appreciated.