Physics
posted by Becky on .
Four uniform spheres, with masses mA = 37 kg, mB = 30 kg, mC = 220 kg, and mD = 55 kg, have (x, y) coordinates of (0, 50 cm), (0, 0), (77 cm, 0), and (44 cm, 0), respectively. Find the net force on sphere B due to the other spheres. What are the (a)x and (b)y components of that net force?
I cant figure out what in doing wrong! please help me :)

Post your work. I can't figure out what you are doing wrong either.

Im using the F=Gm1m2/r^2.
So to figure out the y i plugged in the values for massA and B and used a radius of .5 to get 2.96E7.
For the x i used the same formula but did it twice once for particle CB and the other for BD. then i added them together and got 1.74E7. 
ok, you are not considering the forces to be vectors. Adding them as if they are in a straight line won't work. Sketch the locations, and then the forces have to be added as vectors. I would change each force to components in the x and y direction, then add the x's, to get the x sum, and then the same with the Fy.

Here is a similar (simpler) problem. Study it.
http://answers.yahoo.com/question/index?qid=20080331085912AASJv68 
Thanks it worked :)

Two insulating spheres have radii 0.300 cm and 0.500 cm, masses 0.500 kg and 0.700 kg, and uniformly distributed charges of 2.00 µC and 3.50 µC. They are released from rest when their centers are separated by 1.00 m.