The Bernoulli effect is responsible for the lift force on an airplane wing. Wings must therefore be designed so as to insure that
A) air molecules will be deflected downward when they hit the wing.
B) air molecules will be deflected upward when they hit the wing.
C) air molecules move more rapidly past the upper surface of the wing than past the lower surface.
D) air molecules move more rapidly past the lower surface of the wing than past the upper surface.
E) wings are thick enough to create a significant pressure difference between the top and bottom surfaces of the wings because of the different heights of these surfaces.
C
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Describe the location of Polaris in the sky relative to the horizon as seen by observers in Alaska (lat. = 60° N), Texas (lat. = 33° N), Ecuador (lat. = 0°), and Australia (lat. = 30° S)
What will be an ideal response?
Two spaceships, each 100 m long in its own rest frame, approach Earth from opposite directions, with equal speeds relative to Earth. As measured by a passenger in one of the spaceships, the other spaceship is 96 m long
What is the speed of the spaceships relative to Earth? A) c/7 B) c/6 C) c/5 D) c/4 E) c/3
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Indicate whether the statement is true or false