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Homework Help: Boundary condition of wave impact on mass

  1. May 17, 2015 #1
    1. The problem statement, all variables and given/known data

    Two elastic bars are joined. A step wave is coming in from left. Derive the shape and magnitude of the reflected wave if the right bar is approximated by a rigid body (point- mass) that is free to move in the axial direction.

    3. The attempt at a solution

    I have problem with the boundary conditions, I know that a free will reflect the wave as a tensile wave and that a fixed end (eg wall) will reflect the wave as a stress wave. But what if the "wall" could move? Should i use the conservation of momentum and investigate or is there a equation that can describe this?
  2. jcsd
  3. May 22, 2015 #2
    Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
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