解答
$a_c = \frac{v^2}{r} = \omega^2 r$, directed radially inward toward the center of rotation.
解説
Centripetal acceleration alters the direction of velocity without changing speed. Centripetal force required is $F_c = m a_c = \frac{m v^2}{r}$.
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What is the centripetal acceleration of an object moving at constant speed $v$ in a circle of radius $r$?
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