The two opposing forces determining the vertical position of a parcel of air are
A)buoyant force and gravitational force.
B)centrifugal force and Coriolis force.
C)Coriolis force and buoyant force.
D)gravitational force and pressure gradient force.
E)pressure gradient force and buoyant force.

Question

Quizplus · Accepted Answer

The buoyant force, which is upward, opposes the gravitational force, which is downward. These forces determine whether the parcel of air will rise, sink, or remain at its current altitude. Choice B is incorrect because the centrifugal force is not relevant to vertical motion of air, and the Coriolis force affects horizontal motion. Choice C incorrectly suggests that the Coriolis force affects vertical motion. Choice D is incorrect because the pressure gradient force affects horizontal motion, not vertical motion. Choice E is partially correct in that the pressure gradient force does contribute to vertical motion, but it is not the opposing force to gravity.

The Two Opposing Forces Determining the Vertical Position of a Parcel