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A 45 kg figure skater is spinning on the toes of her skates at 1.1 rev/s...

A 45 kg figure skater is spinning on the toes of her skates at 1.1 rev/s . Her arms are outstretched as far as they will go. In this orientation, the skater can be modeled as a cylindrical torso (40 kg , 20 cmaverage diameter, 160 cm tall) plus two rod-like arms (2.5 kg each, 68 cm long) attached to the outside of the torso. The skater then raises her arms straight above her head, where she appears to be a 45 kg, 20-cm-diameter, 200-cm-tall cylinder.

What is her new rotation frequency, in revolutions per second?

I dont understand why we use the parallel axis theorem for the arms in the first cpnfiguratin can someone plz explain

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