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    quantitykind:PolarMomentOfInertia
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    http://qudt.org/vocab/quantitykind/PolarMomentOfInertia

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    lang:en
    Polar moment of inertia
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    The polar moment of inertia is a quantity used to predict an object's ability to resist torsion, in objects (or segments of objects) with an invariant circular cross-section and no significant warping or out-of-plane deformation. It is used to calculate the angular displacement of an object subjected to a torque. It is analogous to the area moment of inertia, which characterizes an object's ability to resist bending.
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    J_{zz}
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    http://en.wikipedia.org/wiki/Second_moment_of_area