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A 12.1 g CD with a radius of 6.16 cm rotates with an angular speed of 31.1 rad/s. What is its kinetic energy?

K.E. = (1/2) I w^2

I = (1/2) M R^2 = 2.30*10^-4 kg m^2

w is the angular velocity in rad/s

The answer will be in Joules

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