Q.

The lift force acting on the wing of an aeroplane is 2275 N . If the area of the wing is 5 m2 and velocity of air on the lower surface of the wing is 30 m/s , velocity of air on the upper surface of the wing is (density of air is 1.3 k gm3 )

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a

20 m/s

b

25 m/s

c

35 m/s

d

40 m/s

answer is D.

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Detailed Solution

F=ρA2(v22−v12)                          2275=1.3×52[v22−(30)2] v22−900=22753.25=700                     v22=1600⇒v2=40ms−1
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The lift force acting on the wing of an aeroplane is 2275 N . If the area of the wing is 5 m2 and velocity of air on the lower surface of the wing is 30 m/s , velocity of air on the upper surface of the wing is (density of air is 1.3 k gm3 )