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# Moment of Inertia for Figure Skater

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A figure skater during her finale can increase her rotation rate from an initial rate of 1.12 revolutions every 1.88 s to a final rate of 3.15 revolutions per second. If her initial moment of inertia was 4.73 kg* m2, what is her final moment of inertia?

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With clear steps including formulas, calculations and explanation, the problem is solved in three steps of a few lines each.

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Step 1.
The conservation law which applies here is: With no external torque applied during an event, angular momentum will not change. Thus final angular momentum must equal initial ...

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