A ballet dancer spins with 2.4 rev/s with her arms outstretched, when the moment of inertia about axis of rotation is 1. With her arms folded, the moment of inertia about the same axis becomes 0.61. calculate the new rate of spin.

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Physics

Ernesto Patton

14 August, 13:28

A ballet dancer spins with 2.4 rev/s with her arms outstretched, when the moment of inertia about axis of rotation is 1. With her arms folded, the moment of inertia about the same axis becomes 0.61. calculate the new rate of spin.

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Lilly · Answer 1

The majestic ballerina spins faster when her MOI is smallest, which is when she folds up her arms. guessing at proportion, 1 MOI = 2.4 revs, 0.61 MOI = 2.4/0.61 revs which should be faster. It's a bit of a guess though, whilst I imagine "Swan Lake".