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Homework Help: How do i solve this integral?

  1. Sep 6, 2013 #1
    if i have a function U..

    U=∫F∙ds

    where F=<ayz+bx+c , axz+bz , axy+by> , a,b,c are constants

    so.. F=(ayz+bx+c)[itex]\hat{x}[/itex] + (axz+bz)[itex]\hat{y}[/itex] + (axy+by)[itex]\hat{z}[/itex]

    then how do i solve this integral? i have to either replace the x,y,z terms with something in terms of 's' (which is the displacement by the way, ie.. s= [itex]\sqrt{x^2+y^2+z^2}[/itex]
    or i have to replace ds with some parametric ..stuff... how do i evaluate something like this?
     
    Last edited: Sep 6, 2013
  2. jcsd
  3. Sep 6, 2013 #2

    tiny-tim

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    Science Advisor
    Homework Helper

    Hi iScience! :smile:
    Let's write that out in full …

    it's an integral over a curve C between two endpoints P1 and P2: ##U = \int_C \mathbf{F}\cdot d\mathbf{s}##

    so yes you have to use some parameter, which may be s itself, or may be something easier to use, eg θ with ds = (-rsinθdθ,rcosθdθ) :wink:
     
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