Find a unit vectorawhich is horizontal and perpendicular to the vectorb=4i -3j +7k.

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- Jan 8th 2009, 08:49 PMvarunnayuduFind a unit vector
Find a unit vector

**a**which is horizontal and perpendicular to the vector**b=4i -3j +7k.** - Jan 8th 2009, 08:58 PMJhevon
how are you defining "horizontal" here? in the xy-plane?

if so, just make the z-coordinate zero. otherwise, we need the dot product of the vectors to be zero.

so the horizontal vector perpendicular to <a, b, c> is the vector <b, -a, 0>

so here, your vector would be, a = -3i - 4j

now find the unit vector in that direction