The drag of an oceanographic research submarine 9 m mated from wind tunnel tests with a scale model of length 1.5 m and wet- ted surface area 1.2 m2. the measured drag force in the wind tunnel is 7.9 n at a wind speed of 30 m/s and air temperature of 25°c. if the full-scale |submarine is deeply submerged in salt water at 15°c, at what speed can its drag be most accurately predicted? what is the best estimate of its drag at a speed of 2 m/s? can this estimate be refined by raising long is to be esti- lowering the or temperature in the wind tunnel?