1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Finding mass of an object on a spring, given Frequency

  1. Apr 12, 2016 #1
    1. The problem statement, all variables and given/known data
    A mass m at the end of a spring oscillates with a frequency of 0.84 Hz . When an additional 730 g mass is added to m, the frequency is 0.65 Hz .

    2. Relevant equations
    f*2pi = w
    w = (k/m)^1/2
    f = (1/2pi)*(k/m)^1/2

    3. The attempt at a solution
    I simply used the third equation twice, rearranging to the following:
    m = k/(2pi*f)^2
    using this equation two different times I ended up with:
    m = k / (2pi*.84)^2
    m + .73 = k / (2pi*.65)^2
    I solved the above equations for m and came out with the wrong answer.

    Any help is greatly appreciated! Thanks in advance : )
     
  2. jcsd
  3. Apr 12, 2016 #2

    berkeman

    User Avatar

    Staff: Mentor

    Can you show your math at the end where you solve the two equations for m? That may help us spot any errors... :smile:
     
  4. Apr 12, 2016 #3
    Haha, so I attempted to solve my systems of equations three different times and got a very large negative mass, I just attempted it again and got the correct answer.
    Sorry about that ... cheers
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted