"Radian" is a distance. "Revolution per minute" is a speed. Those two units measure different quantities, and they don't convert into each other. It'll help to know that 1 revolution is (2 pi)...
You cannot. Revolutions per minute are a measure of angular velocity whereas metres per minute are a measure of linear velocity. There is no simple way to convert from one to the other.For example,...
A point at a distance of x metres from the centre of an object travels through 2*pi*x metres for each revolution. So if the object is rotating at r revolutions per second, the point in question is...
Not in any sensible way. RPM is a measure of (angular) velocity whereas litres per minute is a rate of flow. Your hard disk will have an rpm but what does litres per miute mean in terms of the disk?