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Homework Help: Finding spring constant k in N/m

  1. Feb 2, 2012 #1
    1. The problem statement, all variables and given/known data

    The graph of displacement vs. time for a small mass at the end of a spring is shown in the figure. At t = 0, x = 0.43 cm. If m = 16.9 gram, find the spring constant, k.

    T = 0.69 seconds
    2. Relevant equations

    F = kx


    3. The attempt at a solution

    mg=kx

    (.0169 kg)(9.8 m/s^2) / (.0043m) = 38.56

    Which is wrong. Is there another way to solve this problem that i'm not seeing?
     
  2. jcsd
  3. Feb 2, 2012 #2
    graph please
     
  4. Feb 2, 2012 #3
    There we go.. can you see that?
     

    Attached Files:

  5. Feb 2, 2012 #4
    if you have done SHM then:
    T=2pi(m/k)^1/2
    From the graph T=0.69sec.
    After putting the i am getting k=1.39 N/m.
    Am I correct.
    Can u tell how to upload picture(from mobile). I am new here
     
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