1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Vector from origin and two points/please explain how to solve it

  1. Sep 10, 2011 #1
    1. The problem statement, all variables and given/known data
    Consider two points located at r1 and r2, separated by distance r=(r1-r2). Find a vector A from the origin to a point on the line between
    r1 and r2 at distance xr from the point at r1, where x is some number
    2. Relevant equations

    3. The attempt at a solution
    I have no ideas about this question, what do I have to find? Please help me
  2. jcsd
  3. Sep 10, 2011 #2
    Drawing, or sketching the problem is always beneficial...
    I took the liberty of doing it for you;
    O-is the origin in this case... try figuring it out now, it should run along more smoothly...

    Attached Files:

    • S_1.JPG
      File size:
      7.1 KB
  4. Sep 10, 2011 #3
    Thanks a lot! But I can not understand a question. What should I find? Components of vector A? Or?
  5. Sep 10, 2011 #4
    Yes, you need to express A using what you've been given, i.e r, r1, r2, xr...
    Keep trying,
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook