The weight of an aeroplane flying in air is balanced by
  • 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
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