When an airplane flies at a constant speed and height above the ground, which statement is true about the forces acting on the airplane ?
(A) The thrust is equal to the drag.
(B) The lift is equal to the weight.
(C) The lift is more than the weight.
(D) Both (A) and (B)
(A) The thrust is equal to the drag.
(B) The lift is equal to the weight.
(C) The lift is more than the weight.
(D) Both (A) and (B)
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Answer:
(A) The thrust is equal to the drag.
Explanation:
The plane is moving at constant speed. From Newton's Ist law, the net external force on plane must be zero. The thrust produced by propeller and the air resistance are equal and are in opposite directions to produce zero net force.