The “noisemaker” B is towed behind the mine-sweeper A to set off enemy acoustic mines such as that shown at C. The drag force of the “noisemaker” is to be studied in a water tunnel at a one-fifth scale (the model is one-fifth the size of the full scale). If the full-scale towing speed is 5 m/s, what should be the water velocity in the water tunnel for the two tests to be exactly similar? What will be the prototype drag force if the model drag force is found to be 2400 N? Assume that seawater at the same temperature is used in both the full-scale and the model tests.

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A