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Given two vectors Vector A = 4.00i+7.00j and Vector B = 5.00i-2.00j , find the vector product A*B (expressed in unit vectors).
Express your answers in i,j,k.
I got 20.0i+14.0j+0k
What is magnitude of the vector product?
Either 280 or 0
Please check it.
Hey Oldspice1212.
Please state the problem precisely: I have absolutely no idea what you are trying to actually calculate since you just give an answer without a question.
Well the first one it asked for Vectors A*B =which I have to put it in terms of unit vectors and second one is asking the same thing but now it's an absolute value so |A*B| for the magnitude
Yeah but what is A and what is B?
Oh I'm sorry I thought it was showing on my thread, I'll fix it right now
There we go, let me know if it makes sense now.
It looks like you have been trying to take the dot product, not the vector product, or cross product.Quote:
Originally Posted by Oldspice1212
The dot product results in a scalar, not a vector:
A dot B = 4*5 + 7*(-2) = 20 - 14 = 6
What method have you learned for calculating the cross product? Keep in mind the answer should be a vector that's perpendicular to both A and B.
Ah I have no clue what the vector product is lol, I always thought you're suppose to use dot product for those kind of questions. What's the vector product?
The dot product is a scalar, a number,Quote:
Originally Posted by Oldspice1212
.
The cross product, vctor product is a vector,.
Didn't I do that? The answer should be the same since you're multiplying both right?
There is no such an operation as vector multiplication.Quote:
Originally Posted by Oldspice1212
There are dot products and cross products but no vector multiplication.
Ok so now I got 0i+0j - 43z...
Is this correct since there are no z components not sure if it should be treated as 1 or 0
IfQuote:
Originally Posted by Oldspice1212
then
Quote:
Originally Posted by PlatoIf
Yes I understand that but I don't get the i and j should they be 0 or should I have put the z components as 1?
Actually Plato, the dot product is often called the scalar product, while the cross product is often called the vector product...Quote:
Originally Posted by Plato
Anyway, the easiest way to evaluate a vector product is using a determinant. If you have two vectorsand
, then their vector product is