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Homework Help: Energy problem

  1. Aug 13, 2008 #1
    i'm confusing on the total kinetic energy and total potential energy of a system.
    The system is like this :

    A block of boby mass,M attached to a spring and damper, which moves to the right, with the end of a rod,m pivoted on the center of the block (rotating).
    let x= displacement, J= Polar moment of inertia, L= length of rod

    Is the
    kinetic energy
    = (1/2)M (dx/dt)^2 + (1/2)(J)(d/dt theta)^2 + (1/2)m{ dx/dt -[L/2][d/dt theta] cos theta }

    Is it correct?
  2. jcsd
  3. Aug 13, 2008 #2
    I got the solution already!!
    Using vectors approach along with lagrange method can solve this problem easily!
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