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HardPhysicsRotational motion
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-- 4. A round disc of moment of inertia I_2 about its axis perpendicular to its plane and passing through its centre is placed over another disc of moment of inertia I_1 rotating with an angular velocity ω about the same axis. The final angular velocity of the combination of discs is
A
(I_1 + I_2)ω / I_1
B
I_2ω / (I_1 + I_2)
C
ω
D
I_1ω / (I_1 + I_2)
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