# Cross Product

Discussion in 'Homework Help' started by mo2015mo, Jun 30, 2013.

1. ### mo2015mo Thread Starter Member

May 9, 2013
157
1
HI guys ,

I have been having problem with the attached question,

i can solve the first situation from my problem
otherwise, i can't solve them due to presence negative sign !!!!...

Is there any way to solve It clearly??

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2. ### WBahn Moderator

Mar 31, 2012
23,160
6,973
If c = a x b, then in terms of c what are

-a x b ?

a x -b ?

-a x -b ?

Either work them through explicitly or use the right hand rule.

Now apply this to your problem.

mo2015mo likes this.
3. ### mo2015mo Thread Starter Member

May 9, 2013
157
1
I Don't understand
i Don't understand this method
I want to clear explanation with examples...

4. ### WBahn Moderator

Mar 31, 2012
23,160
6,973
Vectors:

a = ax*i + ay*j + az*k
b = bx*i + by*j + bz*k

What is (a x b)?

If you can't do that, then you need to go learn what the cross product is and how to take one.

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5. ### mo2015mo Thread Starter Member

May 9, 2013
157
1
i can solve it

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Mar 31, 2012
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