What Is the Unit Vector Perpendicular to Both 4i - 3j + k and the z-Axis?

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SUMMARY

The discussion focuses on finding a unit vector that is perpendicular to both the vector 4i - 3j + k and the z-axis. A vector parallel to the xy-plane must have a zero z-component, making it perpendicular to the unit vector k. The algebraic condition for a vector to be perpendicular to another involves the dot product being zero. The cross product of the vectors 4i - 3j + k and k yields a vector that meets the criteria of being perpendicular to both original vectors.

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Matt2k
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I'm sorry if this is placed under the wrong section of the forum.

But i really need help with a problem.

Well, here it is;

Find a unit vector that is parallel to the xy-plane and perpendicular to the vector 4i - 3j + k *note* there is a ^ above the ijk.
 
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Can you write down an algebraic condition for a vector to be parallel to the xy plane?
What about for a vector to be perpendicular to 4i-3j+k?
And for a vector to be a unit vector?
 
If the vector is parallel to the xy plane, it must be perpendicular to the z-axis. Unit vector k lies on the z-axis. So, if you find a vector that's perpendicular to both unit vector k and your vector, it will solve your problem.

Whenever you take the cross product of two vectors, the result is perpendicular to both of the original vectors.
 

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