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## Homework Statement

If you have data such as time of rotation when arms are extended and the lengths of their folded and extended arms measured from the centre of the skater.

I know I1ω1=I2ω2 and can work out ω from the radius and time of rotation. Where can I go from here to estimate the mass?

Thanks

## Homework Equations

[itex]I_1\omega_1=I_2\omega_2[/itex]

[itex]\omega = \frac{2\pi}{T}[/itex]