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: Calculating percentage uncertainty for young's modulus

  1. Apr 21, 2012 #1
    1. The problem statement, all variables and given/known data

    I cannot work out how to calculate my percentage uncertainty for my coursework, i need to show that my second method has a reduced uncertainty than my first, could anybody please enlighten me as to how to work it out. My table for one of the practicals is attached

    2. Relevant equations

    You probably know this already but just in case

    ∏d2 = cross sectional area
    Extension/Original Length = Strain
    Force Applied/Cross Sectional Area = Stress
    Young's Modulus = Stress/Strain

    3. The attempt at a solution

    Tried numerous times but quite simply don't understand how to get an overall uncertainty for the practical

    I would also like to add that as stated in the 'why hasn't anybody answered me' thread it's the theory that I'm after not for you to do the homework, I understand how that could irritate those helping on here

    Any help would be greatly appreciated, thanks

    Attached Files:

    Last edited: Apr 21, 2012
  2. jcsd
  3. Apr 21, 2012 #2
    After refreshing this page for 2 hours, I tried yet even more possibilities and have figured out how to do this now!
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook