1. Limited time only! Sign up for a free 30min personal 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 help

  1. Jun 16, 2009 #1
    A turntable has mass 4.96 kg and a radius of 0.092 m and is spinning with a frequency of 0.53 rev/s. What is the angular momentum??

    As simple as this problem seems, I just cannot seem to get the correct answer...here is what i have so far:

    I (for a disc) = (1/2)(mr^2)
    L = I(omega)
    I also know that angular momentum = frequency x I

    So,
    0.53rev/s(.5 x 4.96kg x 0.092^2) = 0.011 (kgm^2)/s
    However the correct answer is 0.0699....what am i doing wrong???
     
  2. jcsd
  3. Jun 16, 2009 #2

    Doc Al

    User Avatar

    Staff: Mentor

    L = Iω, where ω is in radians/sec.

    Convert to proper units.
     
  4. Jun 16, 2009 #3

    diazona

    User Avatar
    Homework Helper

    The frequency is in revolutions per second; you need to convert it into radians per second. The conversion factor is [itex]2\pi\ \text{radians} = 1\ \text{revolution}[/itex].
     
  5. Jun 16, 2009 #4
    thanks!
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Angular momentum help
  1. Angular Momentum Help (Replies: 20)

  2. Angular momentum help! (Replies: 5)

Loading...