Problem with angular accelaration

[yaseen shah]

if a beaker is placed on the disk(both are moving with uniform angular velocity).let droplet of water are fallen into the beaker.what would be the effect on uniform angular velocity if it will be angularly accelating.

 

[arildno]

Try to answer the following:
How much does mass situated ON the axis of rotation contribute to the moment of inertia of the WHOLE object?