1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    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!

Is this a trick question or is it just that simple? (magnitude and unit vector)

  1. Sep 1, 2011 #1
    1. The problem statement, all variables and given/known data
    okay i dont have the exact problem in front of me right now but it went something like this: they gave the force, F, which equaled 500 N. for part a they said to express in terms of a magnitude times a unit vector. for part b they wanted the force expressed in orthogonal terms.

    another note: the force makes equal angles with respect the x,y,z axis'
    (theta x = theta y = theta z)
    the only value given is that of the force.

    2. Relevant equations
    F = to the magnitude times unit vector

    3. The attempt at a solution
    a) F being 500 N
    F = magnitude of F times e
    e being the unit vector

    b) for part be would it simply be
    F = magnitude of F times (ei + ej + ek)

    i know the question was just paraphrased but is that what its asking for?
  2. jcsd
  3. Sep 2, 2011 #2


    User Avatar
    Homework Helper

    No, that is wrong. ei+ej+ek is not a unit vector. Find the vector F in the form Fxei+Fyej+Fzek, so that Fx2+Fy2+Fz2=F2
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Threads - trick question simple Date
Static Equilibrium - trick question? Apr 29, 2015
Trick Question? Please help! Nov 9, 2013
Is this a trick question? Nov 29, 2011
Physics Trick Question Oct 2, 2011
Is this a trick question? more springs Aug 17, 2011