As shown in Fig. P7.73, a noisemaker B is towed behind a

Chapter 7, Problem 7.73

(choose chapter or problem)

As shown in Fig. P7.73, a “noisemaker” B is towed behind a minesweeper A to set off enemy acoustic mines such as at C. The drag force of the noisemaker is to be studied in a water tunnel at a \(\frac{1}{4}\) scale model (model 1/4 the size of the prototype). The drag force is assumed to be a function of the speed of the ship, the density and viscosity of the fluid, and the diameter of the noisemaker. (a) If the prototype towing speed is 3 m/s, determine the water velocity in the tunnel for the model tests. (b) If the model tests of part (a) produced a model drag of 900 N, determine the drag expected on the prototype.