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Homework Help: Angular Momentum

  1. May 13, 2016 #1
    I need some clarification on a homework problem related to angular momentum. I understand how to calculate the angular momentum by using L= IW but when calculating the moment of intertia for the particle i dont understand why to use .5m as the radius instead of .4m due to being placed at the 100 cm mark. From all the answers ive seen online and in the back of the book, the answer is calculated using .5m as the radius.

    1. The problem statement, all variables and given/known data

    A particle of mass 0.400 kg is attached to the 100-cm
    mark of a meterstick of mass 0.100 kg. The meterstick
    rotates on the surface of a frictionless, horizontal
    table with an angular speed of 4.00 rad/s. Calculate
    the angular momentum of the system when the stick
    is pivoted about an axis

    (a) perpendicular to the table
    through the 50.0-cm mark and

    (b) perpendicular to
    the table through the 0-cm mark.
  2. jcsd
  3. May 14, 2016 #2


    User Avatar
    Homework Helper

    Where comes 0.4 m as radius come from? The meter stick is 100 cm long, and rotates about the axis going through its middle.
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