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!

Trying to understand an integration example

  1. Feb 11, 2012 #1
    Hello.

    I am having some trouble understanding an integration example we have. I have written it out in the attached pdf. I would be grateful if someone can help me undertand what is going on.

    I assume you let a = (x-RP)/(√2 ΔRP) da to make the process easier, but I am, not sure how that becomes

    1/(√2 ΔRP) dx

    I thought if we took the top line to be a constant, that should have come out as zero?

    -S
     

    Attached Files:

  2. jcsd
  3. Feb 11, 2012 #2

    phyzguy

    User Avatar
    Science Advisor

    You make the substitution a = (x-RP)/(√2 ΔRP) , then take the derivative of this with respect to x. Everything but x is treated as a constant, so this gives
    da/dx = 1/(√2 ΔRP), or dx = (√2 ΔRP) da.
     
  4. Feb 11, 2012 #3
    Hello,

    Thanks for the reply. Right, yea, I think I understand that ...I will run through it a few times just to make sure.

    Thanks.

    -S
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Trying to understand an integration example
  1. Tri Integration (Replies: 6)

Loading...