In norwegian we use a term in statics/mechanics which directly translated means "resistance moment". It is denoted "W" and apparently has two directions x and y, usually written as indexes. For a circle we have(adsbygoogle = window.adsbygoogle || []).push({});

[tex]W_x=W_y=\frac{\pi}{32}d^3[/tex]

What I don't understand is that there is also talk about a "polar" variation of this, which for the circle is

[tex]W_x=W_y=\frac{\pi}{16}d^3[/tex]

Could someone explain to me what this "polar" variation is all about?

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# Resistance moment?

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