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Double Pendulum !

  1. Dec 6, 2009 #1
    Double Pendulum URGENT!

    1. The problem statement, all variables and given/known data
    I am trying to solve this past paper question for my exam tomorrow:
    A double pendulum is constructed using a light rod and light inextensible strings.
    Two string pendulums hanging from ceiling 1m long. 0.1m from top they are connected by a light rod.
    One mass is knocked to the right. Find the beat period in the subsequent motion.


    2. Relevant equations
    I know that they will both undergo shm
    a=-w^2x but I have no idea where to go from here!!!!
     
  2. jcsd
  3. Dec 6, 2009 #2
    Re: Double Pendulum URGENT!

    I don't think I'm allowed to help you with a take-home exam. You better hope your professor doesn't hang out of PF.

    EDIT: One day, I'm going to start reading the first post carefully before replying. Today is not that day!

    I can't visualise the problem. Is it like this?

    ................|.......................
    ................|.......................
    ......______|_______............
    ......|...................|.............
    ......|...................|.............
    ......O..................O.............

    with the rod on top and the pendulums on the side? So the rod is hanging from the ceiling?
     
    Last edited: Dec 6, 2009
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