Question about the sign of angular velocity

  • #1

Homework Statement


The problem is here: It is question #4,
http://faculty.mint.ua.edu/~pleclair/ph125/Exams/Ex3/ph125_s09_exam3.pdf [Broken]

Homework Equations


See Below


The Attempt at a Solution


I have already gotten the answer and know it is correct:
(2m*vi*d)/(((M,clay)+2m)*R^2)
where m is the mass of the clay
My teacher says that the answer I have written above should have a negative sign in front of it. However, I thought angular speed was defined as the magnitude of angular velocity, meaning it is always positive. Who is correct here?
 
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Answers and Replies

  • #2
ehild
Homework Helper
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You are right, the angular speed was asked, and it is the magnitude of the angular velocity, positive.
The angular velocity itself is negative.

ehild
 

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