Angular Motion - calculating rad.s and rev.min

[fionahanson]

Homework Statement

I have a question that I am unsure of how to answer

A round metal bar is machined at a cutting speed of 90.m.min, if the diameter of the bar is 80mm determine...

a. The chuck speed in rad.s and rev.min

If it takes 3s to get to this speed from rest (0)

b. What is the angular acceleration a?

Im not sure of relevant equations for this question, could someone help me work this out please?

Thank you sooo much.

 

[rock.freak667]

the linear velocity is related to the angular velocity by the equation v=rω.

Angular acceleration is the rate of change of angular velocity = dω/dt =Δω/Δt