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... It seems to me that the reasonable criteria are: any
energy associated with the translation of the center of mass
and any net angular momentum (that is gross translation of the
system) should be excluded from the thermal energy. only that
translational motion which is truly random (that is, does not
contribute to any motion of the center of mass), and
rotational motion which is truly random (that is, does not
contribute to the net angular momentum of the system) should
be considered when figuring thermal energy.