# A 12 gram CD with a radius of 6 cm rotates with an angular speed of 34 rad/s. A.) What is its kinetic energy? B.) If its kinetic energy is to be quadrupled, should its angular speed be doubled, quadrupled, or increased by a factor of 16? C.) Calculate the angular speed required to quadruple the kinetic energy the CD had in part A.).

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A 12 gram CD with a radius of 6 cm rotates with an angular speed of 34 rad/s. A.) What is its kinetic energy? B.) If its kinetic energy is to be quadrupled, should its angular speed be doubled, quadrupled, or increased by a factor of 16? C.) Calculate the angular speed required to quadruple the kinetic energy the CD had in part A.).

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Step 1

The moment of inertia of the CD is

Step 2

(A).

Kinetic energy is

Step 3

(B).

If its kinetic energy is to be quadru...

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### Angular Motion 