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

by tyro008
Tags: angular, number, revolutions
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Nov2-08, 02:49 PM
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 [tex]\alpha[/tex] = [tex]\Delta[/tex][tex]\omega[/tex] / time
so (3900rev/min - 1500rev/min)/14,
and this was 10285.71420rev/min^2
i just don't know how to start (B)..
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Nov2-08, 02:50 PM
P: 20
oh sorry, the alpha stands for angular acceleration
the delta of little omega stands for change in anuglar speed :]
Nov2-08, 02:50 PM
P: 20
whoops, change in angular* speed

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