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Homework Help: Variety of Oscillating systems

  1. Dec 9, 2016 #1
    1. The problem statement, all variables and given/known data
    A 3.0kg mass is connected to a system of three springs, k1 = 100N/m, k2 = 80N/m, and k3 = 150N/m, as shown below.
    (a) Derive the relation between k1, k2, k3 and the equivalent spring constant of the three springs together.
    (b) If the mass is pulled 10cm from its equilibrium position and released from rest, what is its speed when it returns to the equilibrium position?
    (c) How much time does it take the mass to complete 4.00 cycles of motion
    Screen Shot 2016-12-09 at 1.31.35 PM.png
    2. Relevant equations
    I solved part a)
    1/k1 + 1/k2 + 1/k3 = 1/keff

    keff = 34.28 N/m

    3. The attempt at a solution

    I just have no idea how to start on part b). Any thoughts please?
    Last edited: Dec 9, 2016
  2. jcsd
  3. Dec 9, 2016 #2


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    Staff: Mentor

    We generally don't allow "I have no idea" on schoolwork problems here. Have you worked any problems yet with springs and masses oscillating?
  4. Dec 9, 2016 #3
    Yes. I was only able to find the angular frequency:
    ω= 3.38 s-1
  5. Dec 9, 2016 #4


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    Science Advisor
    Homework Helper
    Gold Member

    Think about energy.
  6. Dec 9, 2016 #5
    Thank you very much!
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