Discussion
Which balance describes motion with no pressure gradient at all?
Answer: C
With the pressure gradient force absent, the Coriolis force alone supplies the centripetal acceleration, so a parcel traces an inertial circle at constant speed. The circle is anticyclonic in both hemispheres and its period is a pendulum day. Such motion is rarely a good description of the atmosphere but is commonly observed in the ocean mixed layer after a storm has passed, where the currents spiral cleanly for several days. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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