Question: A figure skater (Fig. 9.11) has an initial angular velocity of 3.8 rad/s. She then pulls her arms in, and her angular velocity increases to

A figure skater (Fig. 9.11) has an initial angular velocity of 3.8 rad/s. She then pulls her arms in, and her angular velocity increases to 9.5 rad/s. What is the ratio of her final kinetic energy to her initial kinetic energy??

Figure 9.11

? wi Wf L; = I;w; = Ifwf=L %3D Smaller than I; Larger

wi Wf L; = I;w; = Ifwf=L %3D Smaller than I; Larger than w; A B

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