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Question 6140
NEET Physics · Medium

System of Particles & Rotational Motion: Angular Momentum MCQ

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Angular MomentumMediumQuestion 6140

Question

A disc (I=0.1 kg·m²) rotating at 5 rad/s. Another disc (I=0.1 kg·m²) placed coaxially at rest. New ω:
  1. A
    5 rad/s
  2. B
    2.5 rad/s
    Correct
  3. C
    10 rad/s
  4. D
    1.25 rad/s

Correct answer

2.5 rad/s

Explanation

L = 0.1×5 = 0.5 kg·m²/s. I_total = 0.2. ω = 0.5/0.2 = 2.5 rad/s.

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