A physics teacher sits on a stool that is free to rotate nearly without friction about a vertical axis. His Out stretched hands each hold a large mass so that the rotational inertia is 12kgm By pulling her arms close to her body she is able to reduce her rotational inertia to 6 kg m². If her student starts spinning at0.5 rad/s, what is her speed after she draws her arms in?
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According to conservation of Angular Momentum,
Iω = constant
Hence, when a person sitting on a rotating stool suddenly lowers his hands, then his angular velocity will increase and moment of inertia will decrease.
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