Question
The weight of an aero plane flying in air is balanced by
Options :
Upthrust of the air which will be equal to the weight of the air having the same volume as the plane
Force due to the pressure difference between the upper and lower surfaces of the wings, created by different air speeds on the surface
Vertical component of the thrust created by air currents striking the lower surface of the wings
Force due to the reaction of gases ejected by the revolving propeller
Answer :
Force due to the pressure difference between the upper and lower surfaces of the wings, created by different air speeds on the surface
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