Vectors

**Thomas** · October 30th 2007, 04:25 PM

The only other thing you need to know is the force T has a magnitude of 500N.

I'm having trouble solving this. My process is as follows:

Find a unit vector in direction of C to E
Find components of T using the unit vector from C to E
Find vector r from B to C

I then used the cross product of rBC x T, and am not getting the correct answer.

I'm getting: 33.4i -124.98j - 183.43k (Nm)

The answer is: -12.0i - 138.4j - 117.4k (Nm)

Please help!

**ThePerfectHacker** · October 30th 2007, 07:38 PM

$B = (-.35,0,-2)$ and $C = (0,.2,0)$ this means $\bold{BC} = (0+.35)\bold{i}+(.2-0)\bold{j}+(0+2)\bold{k}$ .

Same idea with $\bold{T}$ which is $(.2-0)\bold{i}+(.4-.2)\bold{j}+(-.1-0)\bold{k}$ .

**Thomas** · October 30th 2007, 08:02 PM

How do you get B = -.35i -.2k? On the diagram, B = .35i + .2k.

Anyway, I know how to do that stuff. I'm just wondering why my answer is wrong - did I do the question the wrong way?

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