Rigid body rotation. Need explanation

  • #1

Homework Statement



https://dl.dropbox.com/u/66988308/Capture.JPG [Broken]

Homework Equations


V=rW


The Attempt at a Solution


I tried to plug in the forumla , and algebras but I keep getting rc/rf as answer instead of rf/rc as the book says.
Work:
Vf=(rf)W
W=Vf/rf
W=Vc/rc

Vc/rc = Vf/rf
(Vc)(rf) = (Vf) (rc)
(Vc)(rf) / (Vf) (rc)= 1
Im not sure if this is the right track.
Thanks for any advice.
 
Last edited by a moderator:

Answers and Replies

  • #2
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391
Please show your working.
 
  • #3
lewando
Homework Helper
Gold Member
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135
The book is correct.
 
  • #4
My work is shown in first post now.
 
  • #5
lewando
Homework Helper
Gold Member
1,349
135
"W" (ω), angular velocity, is not the same in each case.
 
  • #6
6,054
391
Do you know what angular momentum is?
 

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