Calculating Angular Acceleration of a Shaft

[elmariachi]

I have a shaft with radius "r" running at a certain RPM. how can i determine the angular acceleration of the shaft. Do i need any other parameters as well? Can i say that the angular acceleration can be (w^2*r), w is the angular velocity, r being the radius.

thanks

 

[HungryChemist]

is the "certain RPM" a constant? If so, change in angular velocity of time has to be zero.

 

[jf117]

is the "certain RPM" a constant? If so, change in angular velocity of time has to be zero.

In fact, any time an RPM is given it is meant that the rotatory motion is uniform, i.e. the angular velocity is a constant and , therefore, the angular acceleration is zero. Perhaps the problem meant to ask the centripetal acceleration?

J