Afrequently quoted rule of thumb in aircraft design is that wings should produce about 1000 n of lift per square meter of wing. (the fact that a wing has a top and bottom surface does not double its area.) part (a) at takeoff, an aircraft travels at 69 m/s, so that the air speed relative to the bottom of the wing is 69 m/s. given the sea level density of air to be 1.29 kg/m3, how fast must it move over the upper surface to create the ideal lift?

Explanation:

a)

The ideal lift is the relation of the density of the fluid and the velocity so:

The density of the fluid is determinate as a

The area in the situation give the information that the wings produce about 100N of lift per square meter of wings so

The initial speed is

Replacing

Resolve for vf

come closer and become far apart and become steam/gas

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.