Question

How does a ballet dancer take advantage of the principle of conservation of angular momentum?

Answer 1

it increaser her speed by closing her arm and decreases speed by opening her arm

Answer 2

"A ballet dancer can increase her angular velocity by folding her arms and bringing the stretched leg close to the other leg."

When she stretches her hands and leg outward, her moment of inertia increases and hence angular speed decreases to conserve angular momentum. When she folds her arms and brings the stretched leg close to the other leg, her moment of inertia decreases and hence angular speed increases.

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