Which of the following statements about Airplanes are correct? |
1. Today's jet airplanes use the same principles of aerodynamics that the Wright brothers used in 1903 to get their Flyer in the air. |
2. Flight requires two things: thrust and lift. |
3. Thrust is the forward motion provided by a propeller or jet engine. |
4. A wing has to be designed not only to produce lift, but also to minimize the friction with passing air, which causes drag. |
A) 1, 2 and 3
B) 1, 3 and 4
C) 2, 3 and 4
D) All the above
Correct Answer: D
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