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-   -   Find a unit vector... (http://www.physicsforums.com/showthread.php?t=504652)

 MozAngeles Jun6-11 11:55 AM

Find a unit vector...

1. The problem statement, all variables and given/known data

Find a unit vector orthogonal to A in the plane B and C if A=2i-j+k B=i+2j+k and C=i+j-2k

2. Relevant equations

3. The attempt at a solution
Im thinking the solution is to take the cross product of B and C. and that would be the solution??

 rock.freak667 Jun6-11 12:34 PM

Re: Find a unit vector...

Quote:
 Quote by MozAngeles (Post 3341959) 3. The attempt at a solution Im thinking the solution is to take the cross product of B and C. and that would be the solution??
BxC would give satisfy the conditions yes, but you will need to get the unit vector of BxC.

 MozAngeles Jun6-11 12:40 PM

Re: Find a unit vector...

So my answer would be 1/$$\sqrt{35}$$(5i+3k-j)?

 rock.freak667 Jun6-11 09:18 PM

Re: Find a unit vector...

Yes, assuming you calculated BxC correctly.

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