# Homework Help: Gravitational force between the Earth and the Sun

1. Feb 15, 2012

### yumito

1. The problem statement, all variables and given/known data
The question is what is gravitational force between the Earth and the Sun.
We are given the formula F = Gm1m2/d2. I found the mass of the sun and the earth the gravitational constant and the distance. my issue is the G of the equation.

G=6.674 x 10^-11 m^3 / kg s^2

my issue is i cannot solve the problem without knowing what the m,kg,and s are of G. i have seen people answer this the following way

2. Relevant equations

(6.674 x 10^-11 m^3 / kg s^2)(1.9891 x 10^30 kg)(5.9736 x 10^24 kg) / (1.503 x 10^11 m)^2
The answer they got was: 3.510 x 10^22 N

This confuses me because i dont know what their N is either.

The question/TLDR
My guess is ks is just kilograms and m is maybe m2.

What are the variables in gravitational constant.
G= 6.674 x 10^-11 m^3 / kg s^2

m=? kg=? s=?

Also First post :D

Last edited: Feb 15, 2012
2. Feb 15, 2012

### Ray Vickson

m = meters (unit of distance), kg = kilograms (unit of mass), s = seconds (unit of time), N = Newtons (unit of force). They are units, not numbers.

Admittedly, using 'm' and 's' can lead to confusion sometimes, especially since the letter 'm' is often used in Physics to denote a mass, and 's' is often used in other ways, too.

RGV

3. Feb 15, 2012

### SammyS

Staff Emeritus
Hello yumito. Welcome to PF !

4. Feb 22, 2012

### yumito

thanks that helped me out i was quite confused haha. also how do i make the thread solved?