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Homework Help: 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


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    Staff Emeritus
    Science Advisor
    Gold Member

    To answer your first question:


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