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: Define Magnitude

  1. Jan 28, 2010 #1
    Problem: The vector A = (4.0meters)i + (-3.0meters)j
    Find a) its magnitude and b) its angle in relation to i.

    Question: I know magnitude is a scalar but dont know what I am really trying to find in this problem. Am I looking for the direct point from the start of i to the end of j? Do I just need to use the pythagoream therom to find the magnitude.
    To find its angle do I just need to use tangent?
  2. jcsd
  3. Jan 28, 2010 #2


    User Avatar

    Staff: Mentor

    Welcome to the PF. Yes on Pythagoream theorem for magnitude. What trig function can you use to find the angle?

    If you still have problems, just go to wikipedia and look for info on converting vectors between rectangular and polar forms.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook