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A 5.0-g CD with a radius of 6.0 cm rotates with an angular speed of 20 rad/s. What is its kinetic energy?
1 answer
KE = Iω²/2 = mR² ω²/2•2 =0.005•(0.06•20)/4 =1.8•10^-3 J = 1.8 mJ
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