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 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, 06:47 AM #2 Newbie   Joined: Dec 2016 From: Burswood Posts: 1 Thanks: 0 These formulas may help. Sent from my iPhone using Tapatalk
 December 11th, 2016, 10:04 AM #3 Math Team   Joined: Jul 2011 From: Texas Posts: 2,207 Thanks: 1050 (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 $\vec{F} \cdot \vec{r} = ax + by + cz$ Thanks from topsquark
December 11th, 2016, 11:36 PM   #4
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 Originally Posted by skeeter (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 $\vec{F} \cdot \vec{r} = ax + by + cz$
thank you ~~ i got it

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