(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I'm working with some 3-D vectors, which I'm a bit unsure about. I may have more of a clue than I think, but I could use a bit of assistance. So...

I'm dealing with two particles, A and B. A is on the x-y plane where x=y (*corrected: this was mistyped as x=7 when originally posted; it should be x=y) and is 20 meters from the origin, while B is on the y-z plane where y=z and is 40 meters from the origin. Write the two position vectors A and B in terms of their components, and the same for the displacement vector R that goes from A to B. Then, write a force vector F with magnitude 20 Newtons and pointing from A to B (also in component form).

3. The attempt at a solution

My initial and probably primary issue with this problem is determining where these two points are. I presume in digging through my thoughts that A is at point (20, 20, 0) and B (0, 40, 40). That would mean that my components are (for A) 20i + 20j and (for B) 40j + 40k. I'm not positive about this, though, and I'd appreciate some advice. As for the force vector, I realize I need to use (create) a unit vector to do this, but how do I create a vector that is in this 3-D form? My thought is that I could do this when I have the other vector components, but how do I use the magnitude (20 Newtons) in order to solve this?

Thank you for any assistance!

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# A Few Vector Questions

**Physics Forums | Science Articles, Homework Help, Discussion**