A Disc with Moment of Inertia I₁ = 40 Kg $\omega$

question 18

Multiple Choice

A disc with moment of inertia I₁ = 40 kg.m² and angular velocity $\omega$ ₁ = 20 rad/s is dropped on to a stationary second disc along the axis of rotation.The second disc has moment of inertia I₂ = 60 kg.m².What is the angular velocity of the two discs?

• A)4 rad/s
• B)6 rad/s
• C)8 rad/s
• D)12 rad/s
• E)20 rad/s