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A turntable with I = 4 kg m^2 spins at 3 rad/s. With no external torque, I falls to 2 kg m^2. New ω?
A12 rad/s
B6 rad/s
C1.5 rad/s
D3 rad/s
Answer & Solution
Correct answer: B. 6 rad/s
Iω stays constant, so 4 x 3 = 2ω, giving ω = 6 rad/s.
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