| 21. | In either case, the rotating observers see circular motion and require a net inward centripetal force:
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| 22. | In that case the centripetal force is provided by tension in the string, not by gravity.
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| 23. | The present theory concerns only the low energy lightning ball form, with centripetal forces and surface tension.
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| 24. | This force is directed inward, along the direction of the string, and is called a centripetal force.
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| 25. | This pressure gradient provides the centripetal force necessary for the circular motion of each parcel of air.
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| 26. | This pressure gradient provides the centripetal force necessary for the circular motion of each parcel of water.
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| 27. | The parabolic shape is because the centripetal force is proportional to the square of the tangential speed.
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| 28. | The circular stepping pattern also builds up centripetal force, allowing the practitioner to maneuver quickly around an opponent.
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| 29. | All of these changes exemplify the continuing trend of centripetal forces that augmented the power of the regime.
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| 30. | This is a centripetal force distribution.
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