# Help w/ simple dimensional analysis

## 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?

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:

Plug in the units and solve for the gravitational constant.

Redbelly98
Staff Emeritus
Homework Helper
...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,...

Actually they do give that information:

those are the dimensions?

Redbelly98
Staff Emeritus
Homework Helper
Yes.

man, i reall dont understand the question then :surprised

Redbelly98
Staff Emeritus