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Old 12th February 2012, 01:55 PM   #1 (permalink)
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H2 maths vectors question

Here is a vectors question I helped solved at allexperts.com:



Give it a try and see if you can work things out, its not very difficult. Peace.

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Old 12th February 2012, 02:09 PM   #2 (permalink)
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Re: H2 maths vectors question

v x w = |v| |w| sin θ n
(4, 3, -2) / |v||w|n = sin θ

v . w = |v| |w| cos θ
5 / |v||w| = cos θ

tan θ = sin θ/cos θ = (sqrt 29)/5 ?

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Old 12th February 2012, 02:14 PM   #3 (permalink)
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Re: H2 maths vectors question

Originally Posted by aforl View Post
v x w = |v| |w| sin θ n
(4, 3, -2) / |v||w|n = sin θ ***********

v . w = |v| |w| cos θ
5 / |v||w| = cos θ

tan θ = sin θ/cos θ = (sqrt 29)/5 ?
You cannot divide a vector.
But yes if you consider the magnitude of the cross product instead, your answer is correct.
Peace.

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