A student team is to design a human-powered submarine for adesign competition. The overall length of the prototype submarineis 2.29 m, and its student designers hope that it can travel fullysubmerged through water at 0.028 m/s. The water is freshwater (alake) at T = 15°C. The design team builds a one-eighth scale modelto test in their university’s wind tunnel (Fig.Q1). A shieldsurrounds the drag balance strut so that the aerodynamic drag ofthe strut itself does not influence the measured drag. The air inthe wind tunnel is at 25°C and at one standard atmosphere pressure.At what air speed do they need
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