A spherical shell of \( 1 \mathrm{~kg} \) mass and radius \( R \) is rolling with angular speed ...

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A spherical shell of \( 1 \mathrm{~kg} \) mass and radius \( R \) is rolling with angular speed \( \omega \) on horizontal plane (as shown in figure). The magnitude of angular momentum of the shell about the - origin \( O \) is \( \frac{a}{3} R^{2} \omega \). The value of a will be :
(a) 2
(b) 3
(c) 5
(d) 4
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