Rotational Motion Question 193

Question: A round disc of moment of inertia I2 about its axis perpendicular to its plane and passing through its centre is placed over another disc of moment of inertia I1 rotating with w angular velocity co about the same axis. The final angular velocity of the combination of discs is

Options:

A) (I1+I2)ωI1

B) I2ωI1+I2

C) ω

D) I1ωI1+I2

Show Answer

Answer:

Correct Answer: D

Solution:

[d] Angular momentum will be conserved

I1ω=I1ω+I2ωω=I1ωI1+I2



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