(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Let vectors [tex]\vec{A}[/tex]=(2,1,-4) [tex]\vec{B}[/tex]=(-3, 0, 1), and [tex]\vec{C}[/tex]= (-1, -1, 2) .

Calculate the following:

What is the angle[tex]\theta_{AB}[/tex] between [tex]\overline{A}[/tex] and [tex]\overline{B}[/tex] ?

2. Relevant equations

[tex]\vec{A}[/tex] * [tex]\vec{B}[/tex]= magnitude of A * Magnitude of B * Cos[tex]\theta[/tex]

magnitide of X= [tex]\sqrt{a^{2}+b^{2}+C^{2}}[/tex]

3. The attempt at a solution

magnitude of A= 4.58

Magnitude of B= 3.16

[tex]\theta[/tex]=arccos[( A * B)/ magnitude of A * magnitude of B)

I tried that but the incorrect answer. Maybe i did the arithmetic wrong. Please Help..

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# Homework Help: Help with vector physics problem

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