3.(20) The drag characteristics of a blimp{小型軟式飛艇)5 m in diameter and 60 m long are to be stijdjed in wind tMpne). |f the spe^cl of the blimp through still air is 10 m/s, and if a 1/10 scale model is to be tested, what airspeed in the wind tunnel is needed for dynamically similar conditions? Assume the same air pressure and temperature for both model and prototype.