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Homework Help: Frequency difference in two springs with different stiffness factors

  1. Sep 16, 2009 #1
    1. The problem statement, all variables and given/known data

    Your niece is working on a unique science fair project - a clock built around a small mass vibrating on a little spring. Her prototype version is working ok, but it's running too slow. Given your experience in this course, you suggest to her that a stiffer spring should oscillate faster, so she goes out and finds a new one with stiffness constant ("K") that is a factor 2.2 times larger than the prototype spring. How many times larger is the frequency of the new version than the old one? (If you think the new frequency is 2 times the old one, enter 2.0)

    2. Relevant equations

    This is where the problem is lying for me. I'm attempting to use F = 1/2pi*square root of K/M. I'm unable to find the numbers to complete the K/M at all in this question.

    3. The attempt at a solution

    F= (1/2pi)=(.159)
    (.159)*Square root of K/M

    I cannot figure out what K and M should be and am clueless as to how I find the frequency out of this question and compare the two stiffness.
  2. jcsd
  3. Sep 16, 2009 #2

    Doc Al

    User Avatar

    Staff: Mentor

    You don't need the actual numbers. Set up a ratio of the frequencies. Hint: If the original spring constant is K, the new one is 2.2K.
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