Gravitational Force between two equal masses

  • Thread starter physgrl
  • Start date
  • #1
138
0

Homework Statement



Two equal masses are precisely 1 m apart from each other. The gravitational force each exerts on the other is exactly 2. What is the value of each mass?

*a. 1.73*10^5kg

b. 1.50*10^10kg

c. 2.50*10^5kg

d. 1.58*10^10kg

Homework Equations



F=Gmm/r^2

The Attempt at a Solution



I did
F=Gmm/r^2
2=G2m/1 (because the masses are equal)
m=2*1/2G
m=1/G
m=1.50*10^10kg

I dont know why B is wrong and A is right (according to the answer key);
 

Answers and Replies

  • #2
I like Serena
Homework Helper
6,577
176
Hi physgrl! :smile:

I'm afraid that [itex]m \cdot m \ne 2m[/itex].
 
  • #3
138
0
uups my mistake :s
 

Related Threads on Gravitational Force between two equal masses

Replies
4
Views
5K
Replies
2
Views
2K
Replies
9
Views
255
Replies
1
Views
17K
Replies
4
Views
2K
Replies
1
Views
10K
Replies
20
Views
12K
Top