QUESTION 8 A submarine of diameter H, velocity v, moves through water of density

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QUESTION 8 A submarine of diameter H, velocity v, moves through water of density p and dynamic viscosity p. If DF is the drag force on the submarine, then it is known that a law of the following form applies pv for some function G, and where DFpv2H2, p/Hly are dimensionless quantities. Engineers wish to determine the drag on a full size prototype when it is run at v = 15 km/hr. To this end, they build a physically similar 1 /5 th (one fifth) size model. At what speed should they run the model in water in order to mimic the behaviour of the prototype going at 15 km/hr in water? OA 3 km/hr OB. 100km/hr OC 75 km/hr OD. Not enough information has been provided to answer this question

Explanation / Answer

they should run it at 1/5th of its speed i.e. 3km/hr to examine the behavoiur of the prototype

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