http://i26.tinypic.com/27zdaiv.gif
i know that i should do right hand rule to know the result
but here the vectors are weird
??
http://i26.tinypic.com/27zdaiv.gif
i know that i should do right hand rule to know the result
but here the vectors are weird
??
Use this general formula:
$\displaystyle (a\vec{i}+ b\vec{j}+ c\vec{k})\times(u\vec{i}+ v\vec{j}+ w\vec{k})
= (bw- cv)\vec{i}+ (cu- aw)\vec{j}+ (av- bu)\vec{k}$
which can be remembered more easily by thinking of it as a "determinant":
$\displaystyle = \left|\begin{array}{ccc}\vec{i} & \vec{j} & \vec{k} \\ a & b & c \\ u & v & w\end{array}\right|$