12.84. Model: For the (bulletdoor)+system, the angular momentum is conserved in the collision. Visualize:Solve:As the bullet hits the door, its velocity vGis perpendicular to .rGThus the initial angular momentum about the rotation axis, with ,rL=is 2iBB(0.010 kg)(400 m/s)(1.0 m)4.0 kg m /sLmvL===After the collision, with the bullet in the door, the moment of inertia about the hinges is
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