[領域]    古典力學                         (題目相關領域)

[來源]    Goldstein 5.16                        (課本習題、考古題、參考書...)

[題目]    Three equal mass points are located at (a,0,0) (0,a,2a) (0,2a,a).
          Find the principal moments of inertia about the origin and a
          set of principal axes.




[瓶頸]    我不太懂什麼是 principal axes><
          請大大解惑一下...


                         (寫寫自己的想法，方便大家為你解答)


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