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I CM of an object

  1. Nov 25, 2016 #1
    How do you find the CM of a rod of length L and mass m that has been attached by another mass m?

    It is supposed to be 3L/4
  2. jcsd
  3. Nov 25, 2016 #2


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    Cm of rod is at L/2. Attach (assume at the end) another mass of the same size. Cm of rod plus mass is at average position = 3L/4..
  4. Nov 25, 2016 #3
    Could you be more explicit? I was imagining a mass of negligible size being attached to it. Is there a mathematical formula?
  5. Nov 25, 2016 #4


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    The original question said that the rod and the attached mass were both mass m.
  6. Nov 25, 2016 #5
    I got it!
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