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  4. A hoop of mass 500 gm radius 10 cm is placed on a nail, then the moment of inertia of the hoop, when it is rotated about the nail will be kgm 2

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Q. A hoop of mass 500 gm & radius 10 cm is placed on a nail, then the moment of inertia of the hoop, when it is rotated about the nail will be____ $kgm^ 2$

Solution:

$I=mr^2+mr^2=2mr^2$