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: Physics questions from homework

  1. Sep 30, 2006 #1
    Can someone help me with the following questions for homework?

    1. Consider the vector A=7i + 3j - 6k. Find the most general vector in the yz-plane that is perpendicular to A.
    2. Show that the magnitude of the vector product of two vectors is the area of the parallelogram for which the two vectors form adjacent sides.

    Help me, I'm desperate. They might be easy, but I've tried and its no use. If you can solve this problems somehow with full solutions. PLEASE

    You can also e-mail me on:
  2. jcsd
  3. Sep 30, 2006 #2


    User Avatar
    Homework Helper

    Hint regarding 1: What does the scalar product of two perpendicular vectors equal?
  4. Sep 30, 2006 #3
    Scalar product of two perpendicular vectors equals zero, right?, since cos(alpha) of 90 degrees is zero, therefore it should equal to zero.
  5. Sep 30, 2006 #4
    I guess I have forgotten many things about vectors, including their properties. So if the dot product of two perpendicular vectors would equal zero, how can that help figure out the most general vector in the yz-plane that is perpendicular to that vector A, in the previous post given.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Similar Threads for Physics questions homework Date
Question about Electric Field lines (MCQ) Feb 23, 2018
Capacitance questions Feb 21, 2017
Physics Newton's Second law HW Question Feb 11, 2017
Physics 221 Calc-based question for homework Jan 20, 2017