General Questions (74)

71. If a tuning fork is struck and held close to the ear and slowly rotated about the vertical axis in one rotation how many times is there no sound?
72. Vortex generators a. move the transition point forward. Why is this right? Vortex generators don't delay the appearance of the transition point? Please advice
73. Why cabin window shades have to be pulled up before takeoff and landing?
74. Why there are no parachutes on passenger aircraft?
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