Question

Vectors, Help

Answer 1

I don't know if i should take one from another or use the sqrt(x2-x1)^2 + (y2-y1)^2, etc

Answer 2

Where are you stuck?

Answer 3

Just use subtraction. You're trying to find a vector, not a scalar.

Answer 4

Finding the displacement vector

Answer 5

Okay, so i don't need to use the long formula similar to distance formula

Answer 6

You are trying to find the magnitude, which is a scalar, but it isn't asking for that.

Answer 7

And for the angle do i do

Answer 8

\[
\mathbf a\cdot \mathbf b=\|\mathbf a\|\|\mathbf b\|\cos\theta
\]

Answer 9

\[\cos ^{-1}(x 1x2+y1y2+z1z2/|P1P2||P1P3|) \]

Answer 10

Basically what I wrote is what you put when solving for \(\theta\)

Answer 11

Try to understand vectors, not just memorize formula.

Answer 12

ok