Vectors Math Help (solution check)

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In summary, the conversation discusses using specific vectors in 3-space to prove that the cross product of a vector, b, and c is not equal to the cross product of a and b, multiplied by c. The solution is provided in a PDF format and the conversation also mentions the importance of checking solutions by calculating dot products.
  • #1
amy098yay
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Homework Statement


Use three specific vectors in 3 space to show that ⃗ a ×(b⃗ ×c⃗ ) ≠ (a⃗ ×b⃗ )×c⃗

solution is in pdf...

Homework Equations

The Attempt at a Solution

 

Attachments

  • vectorsss.pdf
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  • #2
amy098yay said:

Homework Statement


Use three specific vectors in 3 space to show that ⃗ a ×(b⃗ ×c⃗ ) ≠ (a⃗ ×b⃗ )×c⃗

solution is in pdf...

Homework Equations

The Attempt at a Solution

Looks good now.
For future reference, you can check your answers. a x (b x c) should be perpendicular to both a and a x c. Just calculate the dot product of a and a x (b x c), and of (b x c) and a x (b x c). Each dot product should be zero. Same thing with the other triple product.
 
  • #3
for sure, thank you so much for taking time out of your day to help me with this problem :)
 
  • #4
You're welcome! Most of us helping out here like to do this...
 

FAQ: Vectors Math Help (solution check)

What is a vector in math?

A vector in math is a mathematical object that has both magnitude (size) and direction. It is represented by an arrow pointing in the direction of the vector and its length represents the magnitude.

How do you add two vectors?

To add two vectors, you first place them head-to-tail (one vector's tail touching the head of the other). Then, the sum of the two vectors is the vector connecting the tail of the first vector to the head of the second vector. This is known as the parallelogram method of vector addition.

What is the difference between a vector and a scalar?

A vector has both magnitude and direction, while a scalar only has magnitude. In other words, a vector tells you how far and in which direction to go, while a scalar only tells you how far to go.

How do you find the magnitude of a vector?

The magnitude of a vector is found using the Pythagorean theorem. It is the square root of the sum of the squares of its components. For example, the magnitude of a vector with components (3,4) would be √(3²+4²) = √25 = 5.

Can you have a negative vector?

Yes, you can have a negative vector. This simply means that the vector is pointing in the opposite direction of its positive counterpart. For example, a vector with a magnitude of 5 pointing in the negative y-direction would be represented as (0, -5).

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