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Proving two vectors are perpendicular?

  • 12-11-2013 6:52pm
    #1
    Bazinga_N
    Registered Users, Registered Users 2 Posts: 3,232 ✭✭✭


    I was just wondering if someone could explain how to do a question like this:

    '' Prove that i + 3j is perpendicular to 6i - 2j ''

    If anyone could help I'd really appreciate it :)


Comments

  • #2
    Delphi91
    Registered Users, Registered Users 2 Posts: 1,501 ✭✭✭Delphi91


    Two vectors are perpindicular if.......

    Fill in the blank and that should give you a starting point.


  • #3
    EoghanIRL
    Registered Users, Registered Users 2 Posts: 4,080 ✭✭✭EoghanIRL


    Slope ....
    -J/I


  • #4
    Michael Collins
    Moderators, Science, Health & Environment Moderators Posts: 1,852 Mod ✭✭✭✭Michael Collins


    If the dot product of two non-zero vectors is zero, what does that tell us?


  • #5
    Blackpanther95
    Registered Users, Registered Users 2 Posts: 176 ✭✭Blackpanther95


    Remeber a.b=|a||b|cos(theta) where theta is the angle between the two vecotors, hmmmm i wonder what angle that would be.
    also (ai+bj).(ci+dj)=ac+bd, thats all you need


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