The helicopter in the drawing is moving horizontally to the right at a constant velocity. the weight of the helicopter is w=50900 n. the lift force l generated by the rotating blade makes an angle of 21.0° with respect to the vertical.
(a) what is the magnitude of the lift force?
(b) determine the magnitude of the air resistance r that opposes the motion.

a.

b.

Explanation:

We are given that

Weight of the helicopter=50900 N

The lift force L generated by the rotating blade makes an angle of 21..0 degree with respect to the vertical.

a.We have to find the magnitude of the lift force.

According to question

b.We  have to determine the magnitude of air resistance R that opposes the motion.

R=

v 154.9= 0.9 length length s little over 154.9cm

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.