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

Elsie Santos

27 February, 13:15

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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Peter Sullivan · 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".