Vector question - North-east direction

[cnh1995]

So why will their resultant be at 45 degrees?

Because

Direction of (A + B) is given to be northeast

 

[gracy]

Direction of (A + B) is given to be northeast

No, I meant in the solution direction of (A + B) is given to be northeast.

 

[gracy]

Vector A is pointing eastwards and vector B northwards then direction of (A × B) × (A × B)
1)North - east
2)vertically upward
3)vertically downward
4)None of the above
I tried to draw it[/QUOTE]
I can't differentiate signs of usual multiplication and vector product here.

 

[haruspex]

No, I meant in the solution direction of (A + B) is given to be northeast.

Yes, I see your difficulty. Two ways out: interpret the question as asking which could be right; interpret the answer "north - east" as meaning in that general direction, i.e. in the NE quadrant. Neither very satisfactory I agree.

 

[haruspex]

(A × B) × (A × B)

What is the angle between the two vector arguments to the central x?

 

[gracy]

What is the angle between the two vector arguments to the central x?

Zero. Sin 0=0

 

[haruspex]

Zero. Sin 0=0

So what is (a x b) x (a x b)?

 

[gracy]

So what is (a x b) x (a x b)?

zero

 

[haruspex]

zero

Right.