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8.24. Set Up:
Let the rock initially be traveling to the right and take this to be the
direction. The collision
occurs over a short time interval and the light fixture acquires a small velocity so moves little during the collision.
During the collision the wire remains nearly vertical and exerts little horizontal force on the fixture. Consider the
collision and the motion after the collision as separate events.
Solve:
Collision:
There is no external horizontal force during the collision and
This gives
and
Motion after the collision:
At the maximum height reached by the fixture, all of the initial kinetic energy of the fix
ture is converted to gravitational potential energy. Conservation of energy gives
and
8.25. Set Up:
Apply conservation of momentum to the collision and the workenergy equation to the motion after
the collision. Let
be the direction the bullet was traveling before the collision.
Solve:
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This note was uploaded on 03/06/2009 for the course PHYS 114 taught by Professor Shoberg during the Spring '07 term at Pittsburg State Uiversity.
 Spring '07
 Shoberg
 Light

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