Fly wheel rotating about it's axis slows down from 300 rpm to 100 rpm in two minutes,How many revolutions does the wheel complete during this time?

Fly wheel rotating about it's axis slows down from 300 rpm to 100 rpm in two minutes, What is the Angular acceleration ?

solid sphere of mass 5 kg and radius 1 m is rotating about an axis passing through its centre. find constant tangential force required to rotate the sphere with 10 rad/s in two second . also find number of rotations completed by sphere in that time interval.

Two g of hydrogen diffuse from a container in 10 minute. How many gram of oxygen would diffuse through the same container in the same time under similar conditions:

How many times faster than the present speed should the earth move to rotate about it’s axis, so that the apparent weight of the bodies on the equator becomes Zero.