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12_P84InstructorSolution

12_P84InstructorSolution - 12.84 Model For the(bullet door...

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12.84. Model: For the (bullet door) + system, the angular momentum is conserved in the collision. Visualize: Solve: As the bullet hits the door, its velocity v G is perpendicular to . r G Thus the initial angular momentum about the rotation axis, with , r L = is 2 i B B (0.010 kg)(400 m/s)(1.0 m) 4.0 kg m /s L m v L = = = After the collision, with the bullet in the door, the moment of inertia about the hinges is
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