- #1
Ragnarok7
- 50
- 0
Let [itex]\vec{A}[/itex] represent any nonzero vector. Why is [itex]\frac{\vec{A}}{A}[/itex] a unit vector and what is its direction? If θ is the angle that [itex]\vec{A}[/itex] makes with the positive x-axis, explain why [itex]\frac{\vec{A}}{A}\cdot\hat{i}[/itex] is called the direction cosine for that axis.
I am self-studying and this question has me stumped. I am familiar with the formula for a unit vector but I don't know why it's true and I have never really heard of a direction cosine. Could anyone give me some hints, perhaps?
I am self-studying and this question has me stumped. I am familiar with the formula for a unit vector but I don't know why it's true and I have never really heard of a direction cosine. Could anyone give me some hints, perhaps?