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!

Angular Momentum

  1. Nov 20, 2009 #1
    1. The problem statement, all variables and given/known data
    An ice skater with a mass of 55.5kg is holding on to the end of a 3.75 m long rope tha is attached to a pole protruding out of a frictionless ice covered pond. Intially the skater is making one revolution every 5.44seconds.
    What is the initial angular momentum of the skater?

    A) 780kg m2/s
    B) 901kg m2/s
    c) 11,200 kg m2/s
    d) 18600 kg m2/s
    2. Relevant equations



    3. The attempt at a solution
    I have found the moment of interia, which i found to be 780.47kg m2
    I found the angular velocity to be 1.13rad/s
    The answer i get is not one of the options. I get 881.93kg m2/s
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Nov 20, 2009 #2

    ideasrule

    User Avatar
    Homework Helper

    It's just a rounding error.
     
  4. Nov 20, 2009 #3
    What step is my error in? i have been redoing to equations and keep getting the same
     
  5. Nov 20, 2009 #4

    ideasrule

    User Avatar
    Homework Helper

    Angular velocity is more like 1.15 rads/sec. How did you get 1.13? 1 rev=2*pi, and 2*pi/5.44=1.155 rad/sec
     
  6. Nov 20, 2009 #5
    i did x/1=1/5.44 to get .18revolutions a second and then multiplied that by 2pie to convert to radians a second
    i found my error while doing this it was a rounding error thanks for the help
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Angular Momentum
  1. Angular momentume (Replies: 7)

  2. Angular momentum (Replies: 1)

Loading...