Question

Vectors u=2i+9j+0k and v=13i+18j+0k. What is the value of |u×v|?

Answer 1

This is the magnitude of the cross product.
The cross product is obtained by evaluating the determinant
<b>p</b>
<b>i j k</b>
2 9 0
13 18 0

which is
<b>p</b>=0<b>i</b>+0<b>j</b>+(2*18-9*13)<b>k</b>
=-81<b>k</b>

The magnitude is therefore 81.

Answer 2

thanks sir!!!!

Answer 3

You're welcome!