Physics · SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

Given below are two statements: Statement I: When a girl sitting on a swivel chair stretches her arms horizontally, her moment of inertia about the axis of rotation increases, leading to a decrease in her angular speed. Statement II: In the absence of external torque, the rotational kinetic energy of the girl-chair system remains strictly conserved during the stretching and folding of arms. In the light of the above statements, choose the most appropriate answer from the options given below:

1. A
   Both Statement I and Statement II are correct.
2. B
   Both Statement I and Statement II are incorrect.
3. C
   Statement I is correct but Statement II is incorrect.
4. D
   Statement I is incorrect but Statement II is correct.