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December 11th, 2016, 06:27 AM   #1
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(Vector)How to find the force?

Hi everyone,

I need help~
how to find the force ?
thank you very much~
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December 11th, 2016, 10:04 AM   #2
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(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 $\vec{F} \cdot \vec{r} = ax + by + cz$
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December 11th, 2016, 11:36 PM   #3
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Quote:
Originally Posted by skeeter View Post
(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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