Questions: Consider the vectors u=(1,1,1), v=(2,1,-1). Answer the following questions,
(a) Find a unit vector in the direction of v.
(b) Find u · v.
(c) Find u+v.
(d) Find the angle between u and v.
Transcript text: Consider the vectors $\vec{u}=(1,1,1), \vec{v}=(2,1,-1)$. Answer the following questions,
(a) Find a unit vector in the direction of $\vec{v}$.
(b) Find $\vec{u} \cdot \vec{v}$.
(c) Find $\|\vec{u}+\vec{v}\|$.
(d) Find the angle between $\vec{u}$ and $\vec{v}$.
Solution
Solution Steps
Solution Approach
(a) To find a unit vector in the direction of v, we need to divide v by its magnitude.
(b) To find the dot product u⋅v, we multiply corresponding components of u and v and sum the results.
(c) To find ∥u+v∥, we first find the vector sum u+v and then calculate its magnitude.
Step 1: Unit Vector in the Direction of v
To find a unit vector in the direction of v=(2,1,−1), we first calculate its magnitude: