8. Experiments are to be done on the drag forces on an oscillating fin in a water tunnel. It is assumed that the drag force, FD, is a function of the liquid density, r, the fluid velocity, V, the surface area of the fin, S, and the frequency of oscillation, w: F₁ = f (p,V,S,w) By dimensional analysis, find the dimensionless parameters for this problem. Express your answer in the following form: FD Pos = f(x) PV2S Where T is the dimensionless pi group.