help me with this please fast

(a) Write down the primary dimensions of the following variables: {Pressure}={Density}= [2] (b) A human-powered submarine is being designed. The overall length of the prototype submarine is 5m, and it has to travel fully submerged through water at 0.50m/s in a lake at T=15C. The design team builds a one-fourth scale model to test in a wind tumnel. A shield surrounds the drag balance strut so that the aerodynamic drag of the strut itself does not influence the measured drag. The air in the wind tumel is at 25C and at one standard atmosphere pressure. At what air speed should the wind tunnel be run in order to achieve similarity