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Homework Help: Mass spring system - unknown spring constant

  1. Aug 8, 2015 #1
    1. The problem statement, all variables and given/known data Problem:
    Given the mass spring system solve for k1
    The natural frequency wn = 10 s-1

    2. Relevant equations

    3. The attempt at a solution

    solve for k1

    m x w2n =2.5k1
    k1 = 40 N/m

    Note: I calculate 40 N/m and the solution states 250 N/m. I think I am having a fundamental misunderstanding with mass spring systems. Snapshot.jpg

  2. jcsd
  3. Aug 9, 2015 #2


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    Gold Member

    Is the pulley mass less?
  4. Aug 9, 2015 #3
    yes, I should have put that in the problem stmt.
  5. Aug 9, 2015 #4
    Your determination of the overall spring constant is incorrect. The 2.5 should be in the denominator.

  6. Aug 9, 2015 #5
    Any particular reason?
  7. Aug 9, 2015 #6
    Show us what you did, and I'll show you where you made your error.
  8. Aug 9, 2015 #7
    Last edited: Aug 9, 2015
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