The components of vector A are Ax = + 3.90 and Ay = -4.00. What is the angle measured counterclockwise from the +x-axis to vector A?

Explanation:

Given

X component of the vector is

Y component of the vector is

From the figure, we can write

Thus, the angle measured counterclockwise from the x-axis to vector A is

since you're a real machine, your ama is always less than your ima, because you can never totally eliminate friction.