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Find the magnitude of the gravitational field

  1. Nov 17, 2009 #1
    1. The problem statement, all variables and given/known data

    Find the magnitude of the gravitational field a distance r from an infinitly long uniform thin rod whose mass per unit length is (lamda)

    2. Relevant equations



    3. The attempt at a solution

    Need some clarification really
    i know

    dgx=-Gdm/r2

    r=r2-r1

    lamda=m/L

    i substituded them in and intergrated

    so to finally get

    =-GM/r22-r12
     
  2. jcsd
  3. Nov 17, 2009 #2

    kuruman

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    Homework Helper
    Gold Member

    You need to show the details of what you did. Otherwise it is hard to figure out what you did wrong. However, your final answer must be in terms of lambda r and G. There should be no M (the mass of the rod is infinite) or r1 and r2 (there is only one r, the distance of the point of interest to the rod).
     
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