question_answer

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.

Codes:

A)  1, 2 and 3        

B)  1, 3 and 4

C)  2, 3 and 4        

D)  All the above