1. Limited time only! Sign up for a free 30min personal 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!

Homework Help: Simple mutiplication vector problem

  1. May 20, 2010 #1
    1. The problem statement, all variables and given/known data

    if vector d1=3i-2j+4k and d2=-5i+2j-k then what is (d1+d2).(d1x4d2)? (period between brackets indicates "dot"

    2. Relevant equations


    3. The attempt at a solution

    so i got d1+d2=-2i+0j+3k and d1x4d2=-24i-68j-16k
    what do i do next?
    is the answer (-2)(-24)+(0)(-68)+3(-16)?

  2. jcsd
  3. May 20, 2010 #2
    Yes that's correct, memorize how to calculate the vector product and dot product of vectors, its essential for physics.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook