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Help w/ simple dimensional analysis

  1. Sep 18, 2009 #1
    1. The problem statement, all variables and given/known data

    where F is the magnitude of the gravitational attraction on either body, m_1 and m_2 are the masses of the bodies, r is the distance between them, and G is the gravitational constant. In SI units, the units or force are kg* m/s^2, the units of mass are kg, and the units of distance are m. For this equation to have consistent units, the units of G must be which of the following?


    2. Relevant equations

    F=GM_1M_2/r^2

    3. The attempt at a solution
    i have no idea where to begin. it seems to me they should give me the dimensions of mass and force, but they dont.
     
    Last edited: Sep 18, 2009
  2. jcsd
  3. Sep 18, 2009 #2
    Plug in the units and solve for the gravitational constant.
     
  4. Sep 19, 2009 #3

    Redbelly98

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    Actually they do give that information:
     
  5. Sep 19, 2009 #4
    those are the dimensions?
     
  6. Sep 19, 2009 #5

    Redbelly98

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    Yes.
     
  7. Sep 19, 2009 #6
    man, i reall dont understand the question then :surprised
     
  8. Sep 19, 2009 #7

    Redbelly98

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    Exactly. Plug in the units for F, M1, M2, and r in the equation,

     
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