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Calculate spring constant for cart attached to a spring

  1. Jun 6, 2012 #1
    1. The problem statement, all variables and given/known data
    A Cart is floating on an airtrack and is connected by a spring to one fixed object. The cart executes a simple harmonic motion with a period of 4 seconds. Its mass is 2kg. Its maximum displacement from rest position is 1.8m. Calculate the spring constant and provide units.

    2. Relevant equations
    F= -kx

    3. The attempt at a solution
    The units would be N/m i am guessing but i am still a little lost. k is the spring constant rearranged it should be:
    k = F/x right?
  2. jcsd
  3. Jun 6, 2012 #2
    So far i have, F = mg

    so therefore 2 x 10 = 20N

    and x = 1.8 m

    k = 20/1.8 = 11.11N/m

    Sound alright?

    P.S if a mod sees this please remove my other thread i can't seem to delete it.
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