STANDARDPhysics-Rotational Motion
STANDARD Physics Conservation of Angular Momentum MCQ Question
Type: MCQ-conceptual-Medium
A child is standing with his two arms outstretched at the centre of a turntable that is rotating about its central axis with an angular speed ω₀. Now, the child folds his hands back so that moment of inertia becomes 3 times the initial value. The new angular speed is
A
3ω₀
B
ω₀/3
C
6ω₀
D
ω₀/6
Correct Answer
Option B
Detailed Explanation
Using the conservation of angular momentum, L₁ = L₂ or I₁ω₁ = I₂ω₂. Given I₂ = 3I₁, we have ω₂ = ω₀/3.
Found an issue with this question?