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Does any one know where this formula come from ?

$\alpha (t) = -\omega^2\ \Theta(t)$


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closed as too localized by David Z Dec 18 '12 at 9:36

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up vote 1 down vote accepted

It looks like the formula relating the angular acceleration $\alpha$ and the angular displacement $\theta$. The $\omega$ is the angular frequency and this equation is the same as the simple harmonic oscillator. You can think of a spinning wheel rotating back and fro forever.

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