# Gravitational Force of Particles

Tags:
1. Apr 9, 2016

### heartshapedbox

1. The problem statement, all variables and given/known data
There are three particles;
1) 26kg at 12i-hat
2)13kg at -5j-hat
3)13 kg at 5j-hat

A) What is the gravitational force on the 26kg mass due to the 13kg mass at -5j-hat

2. Relevant equations
F= GMm/r^2

3. The attempt at a solution
A) IN COMPONENTS;
Y Component
F=6.67E-11(13)(26)/5^2
9.01E-10 j-hat
X Component
F=6.67E-11(13)(26)/12^2
=1.57E-10 i-hat

I have solved this problem before in the exact same way and gotten the correct answers. I don't know why there answers are incorrect. Could someone point it out please? Thanks.

2. Apr 9, 2016

### heartshapedbox

−1.2E−10i-hat −5.1E-11 j-hat

3. Apr 9, 2016

### heartshapedbox

Still unsure how the attempt to solve is wrong, help please?

4. Apr 9, 2016

### 256bits

@heartshapedbox
Is the distance between the objects 5j, 12i, or some other number?

5. Apr 10, 2016

### heartshapedbox

Yes that's the distance!

6. Apr 10, 2016

### haruspex

No it isn't.
If fred is 3 m in front of you and Ella is 4m to your right, how far apart are Fred and Ella?