- #1
HappMatt
- 94
- 0
heres the problem.
im supposed to use geometric definition to find. (i+J)cross(i-j)
I know: v x w=IIvIIIIwIISin[theta] and that The answer comes out to be -2k
But what i don't get is looking at the solution manual they show [theta]=pi/4 which i have know clue where that comes from.
I was thinking that i could use (v)dot(w) =Cos[theta] to get[theta] but that ends up being pi/2 not pi/4 like the solution manual says.
I think the solution maunual is wrong after futher review [Theta} should equal pi/2, not Pi/4
im supposed to use geometric definition to find. (i+J)cross(i-j)
I know: v x w=IIvIIIIwIISin[theta] and that The answer comes out to be -2k
But what i don't get is looking at the solution manual they show [theta]=pi/4 which i have know clue where that comes from.
I was thinking that i could use (v)dot(w) =Cos[theta] to get[theta] but that ends up being pi/2 not pi/4 like the solution manual says.
I think the solution maunual is wrong after futher review [Theta} should equal pi/2, not Pi/4
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