Which law is used by a ballet dancer to change her speed or rotation?

How does M.I. change with speed of rotation.

Does M.I. change with change of the axis of rotation?

Explain with an example force can change the speed of an object.

Two dics of moments of inertia I_1 and I_2 about their respective axes (normal to the disc and passing through the centre), and rotating with angular speed omega_1 and omega_2 are brought into contact face to face with their axes of rotation coincident. Does the law of conservation of angular momentum apply to the situation? Why?

...........is the smallest angle through which shape is rotated that it lies on to itself after rotation.

What happens when a spinning ballet-dancer draws her arms close to her chest?

Salma takes 15 minutes from her house to reach her school on a bicycle. If the bicycle has a speed of 2m/s, calculate the distance between her house and the school?