there is another problem that i couldn't solve. it is about circular motion ;(adsbygoogle = window.adsbygoogle || []).push({});

a thin circular horizontal hoop of mass m and radius R rotates at frequency f about a vertical axis through its center. determine the tension within the hoop. (there is a hint : consider a tiny section of the hoop)

and the answer is 2*pi*m*R*f*f but how???????

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# Another problem from giancoli

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