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Uniform circular disk of radius

  1. Mar 31, 2005 #1
    Any help would be great

    Show that the centre of the mass of a uniform circular disk of radius, R, is at a point (4/3pi)R from the centre of the circle.
     
  2. jcsd
  3. Mar 31, 2005 #2
    The center of mass of a uniform disk is the center.
     
  4. Mar 31, 2005 #3
    Yeh thats what I'm having a problem with, seems like a stupid question, but still have to prove that it is (4/3pi)R
     
  5. Mar 31, 2005 #4
    Where is the circle located?
     
  6. Mar 31, 2005 #5
    Thats all the information that is given

    Show that the centre of the mass of a uniform circular disk of radius, R, is at a point (4/3pi)R from the centre of the circle

    Altho below it does say...

    X co-ord is obvious..to find y co-ord integrate using

    Mr = [tex]\int[/tex]rdm

    and transform y into an appropriate co-ord system
     
  7. Mar 31, 2005 #6
    any ideas?
     
  8. Mar 31, 2005 #7
    that doesnt make sense. i dont know what to tell you.
     
  9. Mar 31, 2005 #8
    Don't worry bout it, i'll keep trying
     
  10. Mar 31, 2005 #9

    dextercioby

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    In the way it's formulated,the problem's incorrect.It would have made it interesting,if it had mentioned about a half of the initial disk.

    Daniel.
     
  11. Mar 31, 2005 #10

    DaveC426913

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    Gold Member

    This is nonsense.

    The centre of mass of a circular disc with radius 1 unit is going to be 4.19 units from the centre of the disc?


    I'd like to see that!
    (I could make an end table for my desk that floats in mid-air!)
     
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