Posted by **Jaylee** on Sunday, November 14, 2010 at 1:08pm.

Three masses are arranged in an (x, y)

plane.

7 kg (-3,1)

8 kg (0,0)

9 kg (1,2)

a) What is the magnitude of the resulting force on the 8 kg mass at the origin? The universal gravitational constant is 6.6726 × 10^−11 N · m^2/kg^2. Answer in units of N.

b) What is the angle of the resultant force on the 9 kg mass at the origin?

- PHYSICS CIRCULAR MOTION GRAVITATIONAL CONSTANT -
**Jaylee**, Sunday, November 14, 2010 at 1:09pm
For b): I meant the resultant force on the 8 kg mass at the origin. Sorry!

- PHYSICS CIRCULAR MOTION GRAVITATIONAL CONSTANT -
**bobpursley**, Sunday, November 14, 2010 at 2:12pm
calculate the two forces, magnitude and angle, add them. Compare it to this:

fx=G7*8/9 (-x) + G9*8/1 x add them to get net force in x direction.

fy=G7*8/1(+y) + G9*8/4 (+y) add them to get net force in y direction

Now add these as vectors.

- PHYSICS CIRCULAR MOTION GRAVITATIONAL CONSTANT -
**Jaylee**, Sunday, November 14, 2010 at 2:57pm
I'm sorry, but I'm not understanding your explanation. I figured out the two forces and found the resultant but my answer is wrong and I'm not sure how to use your method.

- PHYSICS CIRCULAR MOTION GRAVITATIONAL CONSTANT -
**KA**, Monday, November 28, 2011 at 8:13pm
What does the G stand for? The gravitational constant??

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