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Home Q & A Board Science-Related Homework Help Physics
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mickey16 mickey16
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11 years ago
What is the cross product of the cross product of the dot product of the vectors a = <3,4,5> and b = <5, 6, 7>?

What does it geometrically mean?
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#1
11 years ago
you cannot find the cross product of the dot product of two vectors.
The dot product of two vectors results in a scalar, and the cross product is an operation formed on two vectors, so you need two VECTORS as inputs.
Your question does not make sense.
wrote...
#2
11 years ago
Lets say you have two vector a and b.  Take the dot product

a . b = s where s  = scalar.  Now the cross product of a scalar with a vector is undefined - cross products are only defined among vectors.  So I don't understand the question.  Perhaps you phrased it incorrectly?
wrote...
#3
11 years ago
Well, when you do the dot product of two vectors, you get a scalar, and when you do the cross product of two vectors, you get a vector back.  In your case though, it's not possible, since you can't do a cross product of scalars because that's not defined.
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