# Rotation acceleration

1. Apr 26, 2015

### Physicsnoob90

1. The problem statement, all variables and given/known data
A disk of radius 16 cm rotating around a fixed axis at its center is accelerated from rest to an angular velocity of +13rev/min in +0.27 rev.

(A )Find the angular acceleration (in rad/s^2), which is assumed to be constant, during this time interval.
(B) what is the total acceleration (magnitude and direction) of the particle located altho the end of this time interval
2. Relevant equations

3. The attempt at a solution
(a) after converting and using ωf^2 = ωi^2+2αΘ, i got α=0.546 rad/s^2

I don't know how to start (B). Can someone help me?

2. Apr 26, 2015

### Simon Bridge

Try rereading your course notes and thinking about what "acceleration" means, then having a go.
i.e. What are the different kinds of acceleration that you know about?
See if you can describe where you have a problem with the question.

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