If $\vec a$=2, $\left | \vec{b} \right |$=3 and $\vec a \vec b$=0 then $(\vec a \times(\vec a \times(\vec a \times \vec b)))$ is equal to:
A)48$\vec b$
B)-48$\vec b$
C)48$\vec a$
D)-48$\vec a$

Answer Choices:
1) A,B
2)A
3)D
4)A, B and D

Question

If $\vec a$=2, $\left | \vec{b} \right |$=3 and $\vec a \vec b$=0 then $(\vec a \times(\vec a \times(\vec a \times \vec b)))$ is equal to:
A)48$\vec b$
B)-48$\vec b$
C)48$\vec a$
D)-48$\vec a$

Answer Choices:
1) A,B
2)A
3)D
4)A, B and D

anonymous · Answer

thanks.... my computers messed up...:(

hero · Answer

How can it be equal to more than one answer?

hero · Answer

Why is there always a shadow watching the chat?

ujjwal · Answer

No idea.. But the answers (vectors) are different only due to their direction. The magnitudes are not different at all.

ujjwal · Answer

LOL

hero · Answer

I don't like shadows. They're creepy

hero · Answer

Are you saying that it is possible for there to be more than one answer?

ujjwal · Answer

Yep, it is possible. But it might have only one answer. I don't know.

hero · Answer

That shadow is bothering me

ujjwal · Answer

Dear shadow, can you leave for a while?

hero · Answer

lol

hero · Answer

He left

ujjwal · Answer

He/she

hero · Answer

I posted something in feedback about these creepy shadows

ujjwal · Answer

LOL.

hero · Answer

There could possibly be two answers due to |b|

ujjwal · Answer

may be.

hero · Answer

only thing is |b| is not included in the computation. Just b is

hero · Answer

Is that how it is supposed to be?

hero · Answer

Do you understand what I mean?

ujjwal · Answer

I have typed the question 100% correctly.

hero · Answer

Okay, so if that's the case then there should only be one answer and b (not |b|) will be a positive vector (I assume)

hero · Answer

so I'm thinking that maybe the |b| is not really that important because |b| = b anyway if || means absolute value

hero · Answer

I hope any of that made any sense

ujjwal · Answer

That is modulus not absolute value.

hero · Answer

I presume modulus doesn't normally have two values

ujjwal · Answer

yep. It has only one value which is the magnitude of Vector.
I am not sure if it can be -ve or not.

ujjwal · Answer

I mean, i am not sure if modulus of a vector can have a negative value or not.

hero · Answer

I was just trying to justify the possibility of two values.

hero · Answer

Do you know the method to find b if given |b| ?

ujjwal · Answer

no idea.

ujjwal · Answer

gtg now. I have to attend classes in a while.

hero · Answer

Okay, good luck. Sorry I couldn't help

ujjwal · Answer

no problem. Thanks for trying. Many don't even do that.