December 11th, 2016, 06:27 AM  #1 
Newbie Joined: Dec 2016 From: HK Posts: 2 Thanks: 0  (Vector)How to find the force?
Hi everyone, I need help~ how to find the force ? thank you very much~ 
December 11th, 2016, 10:04 AM  #2 
Math Team Joined: Jul 2011 From: Texas Posts: 2,105 Thanks: 981 
(i) $\hat{e} = \dfrac{\vec{e}}{\vec{e}}$ (ii) $\vec{F} = \vec{F}\hat{e}$ (iii) $\vec{r} = \vec{B}  \vec{A}$ (iv) work ... if $\vec{F} = ai+bj+ck$ and $\vec{r} = xi+yj+zk$, then $\vec{F} \cdot \vec{r} = ax + by + cz$ 
December 11th, 2016, 11:36 PM  #3 
Newbie Joined: Dec 2016 From: HK Posts: 2 Thanks: 0  

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