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!

Find a vector parallel to two planes

  1. Jan 29, 2006 #1
    there are two planes:

    3x+y+z=1
    3x+z=0

    find a vector U with positive first coordinate that is parallel to both planes.

    the way I went about solving this:
    the normal vectors are: <3,1,1> and <3,0,1>, the cross product of the vectors will give a vector perpendicular to the normal, which means it would be parallel to the two planes right?
     
  2. jcsd
  3. Jan 29, 2006 #2

    0rthodontist

    User Avatar
    Science Advisor

    Yes, that's right.
     
  4. Jan 29, 2006 #3
    when I did this, I get <1,0,-3> and this is not correct. so i do not know where I went wrong
     
  5. Jan 29, 2006 #4

    0rthodontist

    User Avatar
    Science Advisor

    (1, 0, -3) is correct. Maybe you are comparing it to a vector that is a multiple of (1, 0, -3)--there is more than one answer. (2, 0, -6) is also correct.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Find a vector parallel to two planes
Loading...