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: Vector help

  1. Sep 17, 2007 #1
    ive been trying to do this problem but i dont know where to start....any help?

    let v be a vector of length 9 in the direction 65degrees south of west.

    if u has the same direction as v, and if 3|u| = 2|v|, then which of the following can be used to describe u?

    u = 5.705i + 12.235j
    u = -2.536i - 5.438j
    u = 2.536i + 5.438j
    u = -5.705i - 12.235j
    none of these
  2. jcsd
  3. Sep 17, 2007 #2
    What is the magnitude of u? From that find the components of u.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook