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: Stupid question

  1. Oct 3, 2009 #1
    I was reading div grad curl and all that. Couldn't get something basic - cross product.

    U = iux + k df/dx (ux)
    V = jvy + k df/dy (vy)

    UxV = [ -i df/dx - j df/dy + k] uxvy

    can't figure out how to get U x V.
  2. jcsd
  3. Oct 3, 2009 #2


    User Avatar
    Science Advisor
    Homework Helper

    Hi likephysics! :smile:

    (have a curly d: ∂ and try using the X2 tag just above the Reply box :wink:)
    (Let's ignore the common factor, uxvy)

    The i component of UxV is UjVk - VjUk, = 0 - ∂f/∂x.

    Can you do the others now? :smile:
  4. Oct 3, 2009 #3
    Thanks a bunch. Now I feel less stupid. yay!
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook