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!

Urgent- having great difficulty with linear expansion of a tape measure

  1. Jun 9, 2012 #1
    Ok So I was told to think about what would happen if you tried measure something with a metal ruler or tape measure in an environment that would cause negative linear expansion; so the ruler gets smaller. How would the accuracy be affected if the tape measure/ ruler was calibrated at a greater temperature?

    So i was thinking that because of the linear expansion equation: ΔL=αLiΔT, it would be affected by the lengths, temperature differences and coefficients of linear expansion for the two materials (ruler/tape measure & the thing that is being measured).

    Ultimately this leads me to the questions: will the ruler be ever be accurate?
    what are some mathematical methods of finding this out?
    and in different situations how would this affect the measurement?

    some different situations would be:
    same lengths for the two materials
    different lengths
    same coefficient
    different coefficient
    same Δtemp
    different Δtemp

    I would like to be able to write a complete paragraph on this topic with the use of both qualitative and quantitative data: theory and very basic maths. what equations could be used to find this and how could i know if the ruler will be accurate.

    Thanks in advance for any help.

    Gary.
     
  2. jcsd
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

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



Similar Discussions: Urgent- having great difficulty with linear expansion of a tape measure
  1. Linear expansion (Replies: 8)

  2. Linear expansion (Replies: 8)

Loading...