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1. The problem statement, all variables and given/known data

A chain rotates fast. Observation: the chain gets into a horizontal position. Why?

2. Relevant equations

[tex]L=I \omega[/tex] [tex] E= \frac 1 2 I \omega²[/tex] [tex] E=\frac 1 2 \frac {L²} I[/tex]

3. The attempt at a solution

Well, I have two equations for the energy. I know that I have to use the second one, because when I do the experiment I see that the chain "uses" its highest moment of intertia. But I can't I use the first equation for the energy which implies that the chain has to use the smallest moment of inertia to have the minimum energy?

Where is my mistake?

Thanks for help.

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# Homework Help: Moment of intertia of a chain

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