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Nomenclature question

  1. Nov 4, 2015 #1
    Hey guys, quick question.

    I got confused in some nomenclature between some books and wanted to clarify somehow. A book I have has I=Mk^2 as defining a radius of gyration. Is this the same as I-mr^2?

    Terminology was just confusing me.


    Thanks guys.
     
  2. jcsd
  3. Nov 4, 2015 #2
    Oops, I meant I=mr^2.

    apologies
     
  4. Nov 4, 2015 #3

    haruspex

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    It depends what r is supposed to be. Certainly
    "I=Mk2, where M is mass, k is the radius of gyration and I is the moment of inertia about the mass centre"
    is exactly the same as
    "I=mr2, where m is mass, r is the radius of gyration and I is the moment of inertia about the mass centre".
    But most writers reserve r to be a directly observable radius, such as the radius of a hoop or of a point mass in a circular orbit.
     
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