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A one-twentieth-scale model of a submarine is tested at 200 ft/s in a wind tunnel using sea-level standard air. What is the prototype speed (V)

A one-twentieth-scale model of a submarine is tested at 200 ft/s in a wind tunnel using sea-level standard air. What is the prototype speed (V) in sea water at 20? C for dynamic similarity? If the model drag is 1.0 lb, what is the prototype drag?

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