- #1

Wen

- 44

- 0

a student on a free rotaing stool holds two weight, mass each 3kg, 1m from axis of rotation each, and he rotate with angular v of 0.75rad/s. moment if inertia of student +stool= 3kgm2. The student pulls the 2 weights inwards to a position of o.3m from the axis of rotation.

1)what's the student's angular velocity

2)what's his initial and final EK

This question is simple as we just apply the prin. of conservation of angu. momen. Iw initial=Iw final

however, i could not visualise the situation. Where is the axis of rotation? If merely the masses were rotating initially, how could the student possesses any EK?