Register to reply

Angular acceleration

by algorith01
Tags: acceleration, angular
Share this thread:
algorith01
#1
Feb5-10, 04:28 PM
P: 3
1. The problem statement, all variables and given/known data

A high-speed drill rotating ccw at 2200rpm comes to a halt in 2.80 s. What is the drill's angular acceleration?

2. Relevant equations

(where w = angular velocity)
w = 2╥/T
v = wr
a = v^2/r
a = w^2*r

3. The attempt at a solution

I start by calculating w. So first I took it to rev per second and then second per revolution which came to be 0.027 seconds per revolution. So w = 2╥/0.027 = 232.71 radians. Now I'm stuck because I don't have r (radius). I've tried going backwards to get r from v, but to no success since v depends in r as r depends in v. Every equation relating to acceleration seems to need r but I don't see how I can get it. Any ideas would be appreciated. Thanks.
Phys.Org News Partner Science news on Phys.org
Wildfires and other burns play bigger role in climate change, professor finds
SR Labs research to expose BadUSB next week in Vegas
New study advances 'DNA revolution,' tells butterflies' evolutionary history
rock.freak667
#2
Feb5-10, 05:01 PM
HW Helper
P: 6,204
you don't need radius or linear velocity.

[tex]\alpha = \frac{\omega_f - \omega_i}{t}[/tex]
algorith01
#3
Feb5-10, 07:10 PM
P: 3
Thank you. I realized after you posted that equation that it was a nonuniform circular motion problem, I was going about it the wrong way.


Register to reply

Related Discussions
Angular acceleration and angular velocity Introductory Physics Homework 3
Angular Velocity and Angular Acceleration Introductory Physics Homework 5
From Angular Velocity to Angular Acceleration - How? Introductory Physics Homework 1
Are angular displacement, angular velocity, and angular acceleration, vectors? Classical Physics 5
Rotational motion -angular energy+angular acceleration Introductory Physics Homework 4