|Register||Search||Today's Posts||Mark Forums Read|
|Physics Forum Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.|
| ||LinkBack||Thread Tools||Display Modes|
Physics Angular Acceleration of sphere about frictionless axle?
My attempts at getting an answer for this problem haven't been to good, this is the problem below:
A machine part has the shape of a solid uniform sphere of mass 255 grams and diameter 2.70 centimeters. It is spinning about a frictionless axle through its center, but at one point on its equator it is scraping against metal, resulting in a friction force of 0.0200 Newtons at that point.
Find its angular acceleration. Let the direction the sphere is spinning be the positive sense of rotation.
Based on what I have found in my physics book I've been using the following
A is alpha in this situation
T = IA I is moment of inertia
therefore T = Ffrictional * radius
so plugging it in I got .00027 for T
then for I using I = 2/5mr^2 and plugging it all in I got .00002 for I
so A = T/I and I got 13.5 for A which is incorrect
I don't see what I'm doing wrong please help. Thanks in advance.
|acceleration , angular , axle , frictionless , physics , sphere , _|
|Thread||Thread Starter||Forum||Replies||Last Post|
|Moving Dimensions Theory Book Due Out in Fall 05--Very Rough Draft: 4th Dimensions Expanding Relative to 3 Spatial Dimensionsfirstname.lastname@example.org||Physics Forum||64||03-31-2012 10:24 AM|
|Simply put, MOVING DIMENSIONS THEORY is THE NEW MODEL: http://email@example.com||Physics Forum||0||08-29-2006 06:32 AM|
|Moving Dimensions Theory!! Rock Onfirstname.lastname@example.org||Physics Forum||1||07-06-2006 05:19 PM|
|Nobel Prize for David Thomson?!||caltechdude||Physics Forum||428||01-21-2005 09:39 PM|