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!

Maybe a dumb question on standard error in equations

  1. Oct 24, 2012 #1
    1. The problem statement, all variables and given/known data

    I am using a value of change in y say 12.10 cm + or - .06cm.

    I am trying to find velocity using the formula
    v= sqrt(2*g*change in y)

    how do I evaluate this equation with my standard error? because I can't just add or subtract the .06cm after since I will have a value for velocity now.

    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Oct 24, 2012 #2
    Can you just plug in 12.10 cm to get v and then plug in 12.10 cm + .06cm and 12.10 cm - .06cm to figure out the error in v?
     
  4. Oct 24, 2012 #3
    i'm not sure if this was correct but, I plugged in the value with + then plugged in te value with -. Average the two values, and did + or - the difference between the two
     
  5. Oct 24, 2012 #4

    haruspex

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    That'll work. The algebraic way is to approximate sqrt(x + dx) = sqrt(x)sqrt(1+dx/x) as sqrt(x)(1+dx/2x) for small dx.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Maybe a dumb question on standard error in equations
  1. Standard errors HELP (Replies: 1)

  2. Dumb question (Replies: 15)

Loading...