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CBSE Class 11-science Answered

a dancer on ice spins faster when she folds her arms why its happen?
Asked by zainab haseen | 08 Nov, 2013, 05:11: PM
answered-by-expert Expert Answer
When a dancer is spinning, she has a certain angular momentum.
 
When the dancer folds her arms, the distance of all the points of her body decreases with respect to axis of rotation. Thus, in order to conserve angular momentum, the speed of rotation has to increase and hence the dancer spins faster.
 
Similarly, when the dancer stretches her arms, the distance of all the points of her body increases with respect to axis of rotation. Thus, in order to conserve angular momentum, the speed of rotation has to decrease and hence the dancer spins slower.
Answered by Romal Bhansali | 10 Nov, 2013, 12:25: PM

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