NEET2017Physics-Rotational Motion
NEET 2017 Physics Conservation of Angular Momentum MCQ Question
Type: MCQ-conceptual-Medium-Class 11
Two discs of same moment of inertia rotating about their regular axis passing through centre and perpendicular to the plane of disc with angular velocities ω₁ and ω₂. They are brought into contact face to face coinciding the axis of rotation. The expression for loss of energy during this process is:
A
1/2 I (ω₁ + ω₂)²
B
1/4 I (ω₁ - ω₂)²
C
I (ω₁ - ω₂)²
D
1/8 I (ω₁ + ω₂)²
Correct Answer
Option B
Detailed Explanation
The loss of energy is due to the conversion of kinetic energy into heat when the discs come into contact. The expression 1/4 I (ω₁ - ω₂)² represents this energy loss.
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