Asked by j
evaluate the magnitude of (šš + š)
Ć(3š ā šš), knowing that A is defined as š“ = |š Ć š|. (Hint: The cross product is distributive over addition and substraction, e.g., š Ć (š + š) = š Ć š + š Ć š)
A) 10A B) 10ā2š“ C) 12A D) 13A E) none
Ć(3š ā šš), knowing that A is defined as š“ = |š Ć š|. (Hint: The cross product is distributive over addition and substraction, e.g., š Ć (š + š) = š Ć š + š Ć š)
A) 10A B) 10ā2š“ C) 12A D) 13A E) none
Answers
Answered by
oobleck
I hope you're not p, for whom I did almost this very problem ...
since the cross-product is distributive and anti-commutative,
(2u+v)Ć(3uā5v)
= 2uĆ3u - 2uĆ5v + vĆ3u - vĆ5v
= -10uĆv + 3vĆu
= 13vĆu
= 13A
since the cross-product is distributive and anti-commutative,
(2u+v)Ć(3uā5v)
= 2uĆ3u - 2uĆ5v + vĆ3u - vĆ5v
= -10uĆv + 3vĆu
= 13vĆu
= 13A
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