- #1
Sahil Kukreja
- 65
- 15
Homework Statement
A Person sitting firmly over a rotating stool has his arms stretched. If he fold his arms, his angular momentum about the axis of rotation :
A.) Increases
B.) Decreases
C.) Remains Unchanged
D.) doubles
Homework Equations
[/B]Conservation of Angular Momentum
The Attempt at a Solution
Since External Torque =0
Then final angular momentum = initial angular momentum
=> (C.)
But I wanted to further ask that in the Equation L=I*(omega)
since L has to be constant(if external torque = 0) then:
If I increases then omega decreases to keep L constant
or if omega increases then I decreases to keep constant
Will folding his arms increase I( Moment of Inertia ) or decrease it??