Chapter 9.4, Problem 70AYU

To determine

To find: The direction angle of $v$.

Answer to Problem 70AYU

Solution:

$108.4°$

Explanation of Solution

Given:

$v=-i+3j$

Calculation:

The direction angle $\alpha$ of $v=-i+3j$ can be found by solving $\tan \alpha =\frac{3}{-1}=-3$. The direction angle is $\alpha =108.4°$ since $v$ lies in the second quadrant.