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    Undergrad Why is 1/2Iω² not the kinetic energy of a planet in elliptical orbit?

    I think I have no idea about it. I already know the basic formulas, but cannot relate them to this question.
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    Physical Pendulum Formula Derivation

    Homework Statement A physical pendulum, consisting of a uniform rod (of mass M and length L) with an attached blob, can oscillate about an axis that goes through one end of the rod. The mass of the blob is also M. The distance of the blob to the rotation axis is x. The aim is to derive a...
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    Undergrad Why is 1/2Iω² not the kinetic energy of a planet in elliptical orbit?

    Hi everyone. So I got this question in a test, but I'm not exactly sure about the answer. Q: For a planet moving in an elliptical orbit, why is 1/2Iω^2 not the correct expression for its kinetic energy? Thanks a lot in advance.
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