A Disk with Moment of Inertia I₁ = 40 Kg

question 69

Multiple Choice

A disk with moment of inertia I₁ = 40 kg  m² and angular velocity ₁ = 20 rad/s is dropped on to a stationary second disk along the axis of rotation. The second disk has moment of inertia I₂ = 60 kg  m². How much rotational kinetic energy is lost?

• A) 3200 J
• B) 4800 J
• C) 8000 J
• D) 11300 J
• E) 15000 J

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