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[H] Physics C vector proof - Page 2

Blogs > n.DieJokes
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wok
Profile Blog Joined July 2009
United States504 Posts
September 15 2009 04:55 GMT
#21
Gahhh.... you can't use those identities to prove anything... It's reverse logic.
I'll race you to defeatism... you win.
Turbovolver
Profile Blog Joined January 2009
Australia2340 Posts
September 15 2009 08:40 GMT
#22
It's not reverse logic, the dot product is basically a projection, and you prove from trigonometry that

u . v = u v cos (theta).

It's from there that it follows u . v = 0 implies u and v are perpendicular. So, he's working in the right direction.
The original Bogus fan.
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