1. Limited time only! Sign up for a free 30min personal 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!

Homework Help: When i try to do this i end up with a fourth order polynomial

  1. Sep 16, 2016 #1
    1. The problem statement, all variables and given/known data
    The collar A slides on the vertical smooth bar. Masses ma=20 kg, mb = 10 kg, and spring constant k = 250 kN/m. When h = 0.2m, the spring is unstretched. Determine the value of h when the system is at rest. 20160916_204148.jpg

    2. Relevant equations
    sum of all forces equal zero
    sum of all moments equal zero
    can some one please show me how to do this correctly?
    Last edited: Sep 16, 2016
  2. jcsd
  3. Sep 16, 2016 #2

    Charles Link

    User Avatar
    Homework Helper
    Gold Member

    I also get a 4th order polynomial in h. The equations are simple enough for the forces, but the clumsy geometry seems to create this complexity.
  4. Sep 16, 2016 #3
    Ok, thank you I will try to solve it then.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted