How do I choose the correct angle when graphing vectors from unit notation?

Thread starter tunze
Start date Sep 15, 2011
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Angle Graphing Notation Unit Vectors

AI Thread Summary

When graphing vectors from unit notation, it's essential to correctly identify the angle that represents the vector's direction. The vector given is 2.0i - 6.0j, which indicates its components along the x and y axes. The confusion arises from choosing between different angles; the angle should be measured from the positive x-axis in a counterclockwise direction. To find the magnitude, use the Pythagorean theorem, and for the direction, apply the arctangent function to the y and x components. Correctly identifying the angle is crucial for accurate vector representation.

Sep 15, 2011

tunze

Homework Statement

Draw the following vector. Label the angle that specifies the vector's direction, then find its magnitude and direction.

Homework Equations

vector a = 2.0i - 6.0j

The Attempt at a Solution

I get stuck here:

I don't know which angle to use.

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Sep 15, 2011

tunze

I used the red one but the back of the book uses the brown one :/

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