Question

I beg assistance in differentiating cetripidel and angular acceleration. More info in comments.

Answer 1

They're asking me to describe a situation when the angular acceleration of a particle on a phonograph turntable is zero, but the centripidel acceleration is not.

Answer 2

Steady rotation of the turntable describes what you need: all (fixed) particles on it will have zero angular acceleration.

Their linear acceleration will be purely centripetal (no tangent component).

Answer 3

Oh! Dur. Thank you, sir!