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: Subtracting Vectors

  1. Oct 23, 2009 #1
    This is the problem that I was given:

    Given two vectors A and B, with magnitudes |A| = 45.7 and |B|=38.2 and directions (from the x-axis) θA=64° and θB=145°, find the magnitude of (A-B)

    I know that this somehow involves triangles and trigonometry, but I am really confused as to how I do this. Please help!
  2. jcsd
  3. Oct 23, 2009 #2


    User Avatar

    Staff: Mentor

    Welcome to the PF. To add/subtract vectors, you will use rectangular coordinates and rectangular components, and then convert back into polar form if needed for the final answer.

    Does that make sense? If not, go to wikipedia.org, and search on vector rectangular polar conversion. Actually a better match at wiki is vector polar coordinate system...
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook