Finding the number of revolutions for an car in an angular system

1. Nov 2, 2008

tyro008

1. The problem statement, all variables and given/known data

The angular speed of an automobile engine is increased at a constant rate from 1500 rev/min to 3900 rev/min in 14 s.
(A) What is its angular acceleration in revolutions per minute-squared?

(B) How many revolutions does the engine make during this 14 s interval?

2. Relevant equations
I found out (A) to be 10285.71429 rev/min^2, but I have no idea how to do (B). would have to find tangential velocity or do i have enough information already?

3. The attempt at a solution
for (A), i used the formula $$\alpha$$ = $$\Delta$$$$\omega$$ / time
so (3900rev/min - 1500rev/min)/14,
and this was 10285.71420rev/min^2
i just don't know how to start (B)..

2. Nov 2, 2008

tyro008

oh sorry, the alpha stands for angular acceleration
the delta of little omega stands for change in anuglar speed :]

3. Nov 2, 2008

tyro008

whoops, change in angular* speed