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Homework Help: Center of Mass and Moment of Inertia

  1. Mar 24, 2008 #1
    1. The problem statement, all variables and given/known data

    Find the center of mass of the collection of mass points in Figure P.12 and then find the moment of inertia of the system about an axis through the center of mass and parallel to the y-axis.


    2. Relevant equations

    Center of Mass
    Moment of Inertia

    3. The attempt at a solution

    M1 = 1kg, r1 = (1i + 0j) m
    M2 = 2kg, r2 = (4i + 0j) m
    M3 = 3kg, r3 = (6i + 0j) m
    Mass total = 6kg

    X of CM = 1/6 (0 + 8 + 18) = 13/3 m
    Y of CM = 1/6 (0 + 0 + 0) = 0 m

    I = mR[tex]^{2}[/tex]
    I = 6 (4.333)[tex]^{2}[/tex]
    I = 112.6667 kgm[tex]^{2}[/tex]

    The answer was wrong. Thanks for the help
     

    Attached Files:

  2. jcsd
  3. Mar 24, 2008 #2
    moving it up
     
  4. Mar 25, 2008 #3
    moving it up again
     
  5. Mar 25, 2008 #4
    I wouldn't keep bumping this thread until your attachment has been approved. ;)
     
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