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

by tyro008
Tags: angular, number, revolutions
 P: 20 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)..