1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Question about the sign of angular velocity

  1. May 3, 2013 #1
    1. The problem statement, all variables and given/known data
    The problem is here: It is question #4,
    http://faculty.mint.ua.edu/~pleclair/ph125/Exams/Ex3/ph125_s09_exam3.pdf [Broken]

    2. Relevant equations
    See Below


    3. 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?
     
    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. May 3, 2013 #2

    ehild

    User Avatar
    Homework Helper
    Gold Member

    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
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Question about the sign of angular velocity
Loading...