Go Back   Physics Help Forum > College/University Physics Help > Advanced Mechanics

Advanced Mechanics Advanced Mechanics Physics Help Forum

Reply
 
LinkBack Thread Tools Display Modes
Old Nov 10th 2008, 02:35 AM   #1
Member
 
Join Date: Jul 2008
Posts: 60
Angular acceleration

Hey guys.
I got this poll which is at one side connected to a wall and is being released from a horizontal state.
his length is L and mass m.
I need to find the angular acceleration of the poll as a function of the angle.
I got this answer in the pic but according to them the answer should be what I marked in the red box.

Any idea? am I wrong?

10x.
Attached Thumbnails
Angular acceleration-scan0008.jpg  
asi123 is offline   Reply With Quote
Old Nov 10th 2008, 04:58 AM   #2
Member
 
Join Date: Jul 2008
Posts: 60
Ok, I know what the problem is, I made a mistake in the moment of inertia...

I do have another question due.
First of all, when they say this is the angular acceleration of the poll, does it mean the angular acceleration of the center of mass?
In the next part of the question, they ask for the angular velocity as a function of $\displaystyle \varphi$.
I tried to use energy conservation and came up with this equation:
$\displaystyle mgL=mgL(1-1/2\cos(\varphi))+1/2 mv^2+1/2 I\omega^2$
When
$\displaystyle v = \omega*(L/2)$

Is this right?

10x.
asi123 is offline   Reply With Quote
Old Nov 10th 2008, 07:48 AM   #3
Member
 
Join Date: Jul 2008
Posts: 60
Never mind guys, I got it.
asi123 is offline   Reply With Quote
Reply

  Physics Help Forum > College/University Physics Help > Advanced Mechanics

Tags
acceleration, angular



Thread Tools
Display Modes


Similar Physics Forum Discussions
Thread Thread Starter Forum Replies Last Post
Angular velocity and acceleration skp123 Kinematics and Dynamics 0 Feb 2nd 2010 06:43 AM
Magnitude of Angular Acceleration tag16 Periodic and Circular Motion 5 Jun 19th 2009 08:10 PM
Angular acceleration Piedog769 Advanced Mechanics 1 Apr 1st 2009 11:20 AM
Angular acceleration chino109 Advanced Mechanics 2 Mar 19th 2009 10:08 PM
angular acceleration of a fishing rod purich Kinematics and Dynamics 1 Mar 11th 2009 11:15 AM


Facebook Twitter Google+ RSS Feed