Circular Motion and Oscillationshave been sick and am lost

[yvette262]

Homework Statement

A particle begins at rest on a circular track and is subjected to a constant angular acceleration of magnitude α beginning when t=0s.(a) Show that the magnitudes of the tangential and centripetal accelerations of the particle are equal when

t=(1/α )^(1/2)

Independent of the radius of the circular track. (b) What is the angle that the total acceleration vector makes with the radial direction at this time?

 

[tiny-tim]

hi yvette262! welcome to pf!

Show us what you've tried and where you're stuck, and then we'll know how to help!

("constant angular acceleration of magnitude α" means θ'' = α)