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Homework Help: AP Physics HW Help - Motion of 2 Pendulums

  1. Sep 4, 2013 #1
    AP Physics HW Help -- Motion of 2 Pendulums

    1. The problem statement, all variables and given/known data

    A system consists of two metal balls hanging by strings of length L fixed at a common point as shown. Pendulum A has a mass of 2kg and Pendulum B has a period of 2.0s.

    a. What is the length L of each pendulum?
    b. What is the maximum speed Pendulum A reaches after being released from a height of 0.6m above its equilibrium position (neglect friction)
    c. Pendulums A and B are released at the same time from the same height, colliding right in the middle of their arcs. If Pendulum A comes to a complete stop after the collision while Pendulum B moves backward with half of its original speed, what is the mass of Pendulum B>

    2. Relevant equations

    Period equations
    Kinetic Energy Maybe?
    Conservation of momentum

    3. The attempt at a solution

    For a. I used to formula Tp=2Pi(sqrrt of L/g)
    For b. I have no clue maybe use something with KE and PE
    For c. Conservation of momentum formula im thinking?


    Last edited: Sep 4, 2013
  2. jcsd
  3. Sep 5, 2013 #2
    You have all the right ideas - just use them.
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