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: Error propagation for effective spring constant

  1. Oct 11, 2012 #1
    1. The problem statement, all variables and given/known data

    Calculate the error propagation for the theoretical effective spring constant for the two springs. The actual values don't matter, it's just supposed to show how it would be calculated.

    2. Relevant equations


    3. The attempt at a solution

    ke=A*B/(A+B) (Let A=k1, B=k2)

    I have come up with two possibilities, but I'm not sure if either is correct. The addition in the denominator is confusing me.

    Possibility 1: σ(ke)/|ke|=σ(A)/|A| + σ(B)/|B| + σ(A) +σ(B)

    Possibility 2: σ(ke)/|ke|=σ(A)/|A| + σ(B)/|B| + (σ(A) +σ(B))/|A+B|
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted