55. The axis of rotation is in the middle of the rod, with r= 0.25 m from either end. By Eq. 11-19, the initial angular momentum of the system (which is just that of the bullet, before impact) is rmvsinθwhere m= 0.003 kg and = 60°. Relative to the axis, this is counterclockwise and thus (by the common convention) positive. After the collision, the moment of inertia of the system is
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