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Quick Guass's Law of Gravitation Clarification

  1. Apr 11, 2013 #1
    1. The problem statement, all variables and given/known data

    The picture attached shows the answer to a sample problem... I don't understand the last step... how does ∇g = C (1/r^2)∂/∂r(r^4) ??? where did the r^4 come from and what does the triple dot triangle: "∴" mean? I understand every step except for the last one... thanks

    2. Relevant equations



    3. The attempt at a solution
     

    Attached Files:

  2. jcsd
  3. Apr 11, 2013 #2

    cepheid

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    To answer your first question:

    http://en.wikipedia.org/wiki/Divergence#Spherical_coordinates


    To answer your second question, this symbol: ##\therefore## means, "therefore."
     
  4. Apr 11, 2013 #3
    ahh thank you so much
     
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