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55. The axis of rotation is in the middle of the rod, with
r
= 0.25 m from either end. By
Eq. 1119, the initial angular momentum of the system (which is just that of the bullet,
before impact) is
rmv
sin
θ
where
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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 Spring '08
 Any
 Physics, Angular Momentum, Momentum

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