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9 January, 23:08

Find the length l of one "arch" of this cycloid, that is, find the distance traveled by a small stone stuck in the tread of a tire of radius r during one revolution of the rolling tire.

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  1. 10 January, 01:00
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    If there is no slipping or skidding going on, then for each revolution, the tire rolls along the ground a distance equal to the tire's circumference.

    Circumference of the tire = 2 · π · Radius.

    During the same revolution, the small stone stuck in the tread travels in a big semicircular arc that's (2 · π · r) long. (roughly 6.28r)
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