Magnitude of Angular Acceleration

[tag16]

Homework Statement

A disk rotates with constant angular acceleration. The initial angular speed of the disk is 2π rad/s. After the disk rotates through 1π radians, the angular speed is 14π rad/s. What is the magnitude of the angular acceleration?

Homework Equations

w=w0+at

The Attempt at a Solution

I tried to use w=w0+at but that didn't work. What equation do I need to use?

 

[LowlyPion]

Homework Statement

A disk rotates with constant angular acceleration. The initial angular speed of the disk is 2π rad/s. After the disk rotates through 1π radians, the angular speed is 14π rad/s. What is the magnitude of the angular acceleration?

Homework Equations

w=w0+at

The Attempt at a Solution

I tried to use w=w0+at but that didn't work. What equation do I need to use?

Consider using another equation.
http://hyperphysics.phy-astr.gsu.edu/hbase/mi.html#rlin

One that doesn't involve time as a variable.