*Vector Algebra*

  • Thread starter physixguru
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  • #1
physixguru
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Homework Statement



a(v), b(v) and c(v) are three vectors. if a(v) x b(v) = c(v) and b(v) x c(v)= a(v)
Show that b(mod)= 1 and a(mod)=c(mod) and the three vectors are mutually perpendicular.
(v) denotes vector and (mod) denotes magnitude.
2. Homework Equations [/]

NA.

The Attempt at a Solution



Got some of it.Need a bit more explanation.
 

Answers and Replies

  • #2
Defennder
Homework Helper
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To show that they are perpendicular, you need to show that [tex]\vec{a} \cdot \vec{b} = 0[/tex], since you already know that vector c is perpendicular to both a and b. See if you can apply this to what you are given.

As for the other two, one follows from the other. Just use the formula for magnitude of vector product on both given vector equations and compare them.

This should help:
http://en.wikipedia.org/wiki/List_of_vector_identities
 
  • #3
physixguru
335
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Thanks bro.How did ya know if c was perpendicular to both?
 
  • #4
elbarto
33
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because C is the cross product of A and B, hence it must be perpendicular to both vectors.
 
  • #5
physixguru
335
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Thanks lord.I missed such a silly thing.
 

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