In very small, violent spinning systems like tornadoes or dust devils, the Coriolis force is too weak to matter. Instead, the wind is a balance between the Pressure Gradient Force (pulling air into the center) and the Centrifugal Force (pulling the spinning air outward). This is known as “Cyclostrophic Flow,” and it allows for incredibly tight, fast rotations. ANSWER: (B) Balance between Pressure Gradient and Centrifugal forces
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For large-scale storms like hurricanes, the Earth’s rotation (Coriolis) is the main partner to pressure. But in a small tornado, the wind is spinning so fast over such a tiny area that the outward “fling” of the spinning air (Centrifugal force) becomes the most important factor. The air wants to rush into the low-pressure vacuum at the center, but its own spinning speed pushes it back out. This balance allows the tornado to maintain its narrow, pipe-like structure. This is a “hard” concept because it shows that different physical laws take over depending on the size of the storm.
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