1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    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!

Calc III

  1. Feb 1, 2009 #1
    1. The problem statement, all variables and given/known data

    Find a unit vector that is parallel to the vector from )5,1,-3) to (2,1,1)



    2. Relevant equations



    3. The attempt at a solution

    I will appreciate any HINT for this problem b/c I am totaly confused from the why how the question is stated. Please help.
     
  2. jcsd
  3. Feb 1, 2009 #2
    First find a vector that goes between those 2 points
     
  4. Feb 1, 2009 #3
    Well, you know what the direction of the vector is, you just have to scale it correctly...
     
  5. Feb 1, 2009 #4
    Well, you know what the direction of the vector is, you just have to scale it correctly...

    I don't think I get this that I have to scale it correctly...
     
  6. Feb 1, 2009 #5
    What's the difference between any old vector and unit vector?
     
  7. Feb 1, 2009 #6
    okay, I am following the textbook and nothings helps.

    The points (5,1,-3) and (2,1,1) are the points of the vector V=<-3,0,4>

    Then ||v||= 5
    u= v/||v||= 1/5<-3,0,4>
    Two nonzero vectors u avd v are parallel if there is some scalar c
    such that
    u=c.v

    Am I even close with this solution? I am getting more confused.
     
  8. Feb 1, 2009 #7

    Mark44

    Staff: Mentor

    That's the vector you want.
     
  9. Feb 1, 2009 #8
    Thank you.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Calc III
  1. Calc III (Replies: 4)

  2. GREEN'S THRM Calc III (Replies: 11)

  3. Calc III differential (Replies: 5)

Loading...