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Q.

The weight of an aeroplane flying in air is balanced by

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a

Upthrust of the air which will be equal to the weight of the air having the same volume as the plane

b

Force due to the pressure difference between the upper and lower surfaces of the wings, created by different air speeds on the surface

c

Vertical component of the thrust created by air currents striking the lower surface of the wings

d

Force due to the reaction of gases ejected by the revolving propeller

answer is B.

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Detailed Solution

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Dynamic lift is created against the weight of an aeroplane because of difference in speeds of air produced due to design of the wings.

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