A figure skater (see figure below) has an initial angular velocity of 4.0 rad/s.

Question

A figure skater (see figure below) has an initial angular velocity of 4.0 rad/s. She then pulls her arms in, and her angular velocity increases to 9.4 rad/s. What is the ratio of her final kinetic energy to her initial kinetic energy?

Please answer, thank you so much in advance!

e Safari FileEditViewHistory Bookmarks windowHelp Q 60%E, -- Sun 9:21:43 PM QE - - - - webassign.net 9, +-7.69 points GioCP29.P077 My Notes Ask Your Teacher A figure skater (see figure below) has an initial angular velocity of 4.0 rad/s. She then pulls her arms in, and her angular velocity increases to 9.4 rad/s. What is the ratio of her final kinetic energy to her initial kinetic energy? KEnnal KEinitial Smaller Larger than I than o Submit Answer Save Progress Home My Assignments Extension Request

Explanation / Answer

WE know that angular momentum will be conserved in this whole process.

So,

4I1=9.4I2

I1=2.35I2

And KEfinal/KEinitial=

I2*9.42/I1*16

=2.35

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