This is my problem:

Question

A particle with a density of 0.9g/ml is suspended in a solution that has a density of 1.1g/ml. It cannot be sedimented. Using the equation that describes the movement of a particle in a centrifugal field, describe why this is true.
The issue I'm having is that none of the equations provided in the exercise reference density of the particle vs. density of the solution. Logical deduction tells me that a less dense particle will float in a more dense solution, but without knowing the equation, I can't figure out what effect the application of a centrifugal field will have on it. Based on the wording of the question, I would assume no effect. But why?