Why does a rotating rod have normal acceleration?

[werson tan]

Homework Statement

why the normal acceleration is 6 rads^-1 ? It's not stated in the question , right?
Can someone explain more about normal acceleration? i couldn't understand it . I only know that when the rod is rotated , it has tangential acceleration

Homework Equations

The Attempt at a Solution

 

[BvU]

Homework Statement

why the normal acceleration is 6 rads^-1 ? It's not stated in the question , right?
Can someone explain more about normal acceleration? i couldn't understand it . I only know that when the rod is rotated , it has tangential acceleration

It's not stated in the question. But not in the solution either! Something has to keep G in a circular trajectory and that requires an acceleration $\ \omega^2 r.\ \ \$ That $\,\omega$ is given in the problem statement!

For the kinematics of rotational motion: this (only the comparison), that or any textbook ! Did I forget hyperphysics?