Help w/ simple dimensional analysis

  • #1

Homework Statement



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?


Homework Equations



F=GM_1M_2/r^2

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:

Answers and Replies

  • #2
Plug in the units and solve for the gravitational constant.
 
  • #3
Redbelly98
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...it seems to me they should give me the dimensions of mass and force, but they dont.

Actually they do give that information:
In SI units, the units or force are kg*m/s^2, the units of mass are kg,...
 
  • #6
man, i reall dont understand the question then :surprised
 
  • #7
Redbelly98
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Plug in the units and solve for the gravitational constant.

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

CocoonOHorror said:
F=G M_1 M_2 / r^2
 

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