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Chapter08c

# Chapter08c - Air Pressure and Winds III Due to the rotation...

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Air Pressure and Winds III

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Coriolis Force (Effect) It is an apparent force; Dueto the rotation of the coordinate system (Earth); It makes a moving object deflect from a straight line even in the absenceof any forces acting on it.
Coriolis Force Demonstration Rotating table A B Dashed line - the trajectory of the chalk with respect to a non-rotating table. Solid line - the trajectory of the chalk with respect to a rotating table.

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The Magnitude of the Coriolis Force The rotation of the Earth The faster theplanet rotates the bigger the force The speed of the object Bigger V -> bigger effect The latitude : Min. at the equator Max. at thepoles φ sin 2 V m F co =
φ sin 2 V m F co = The speed of theobject The latitude : Min. at the equator Max. at thepoles Coriolis force as a function of:

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The Direction of the Coriolis Force In the Northern hemisphere thedeflection is to the right of the direction of motion. In the Southern hemisphere thedeflection is to the left of thedirection of motion. The winds in the Northern hemispherewill bedeflected to theright and in the Southern hemisphere they will bedeflected to theleft. Hurricanes spin differently in theNorthern and Southern hemisphere
The Coriolis Force and the Earth The Coriolis effect is important when moving over LARGE distances (air planetravel), with large velocities, away from the equator.

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