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

1. Sep 1, 2011

### IHave

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. Sep 2, 2011

### ehild

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