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

Thread starter tunze
Start date Sep 15, 2011
Tags

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.

Physics news on Phys.org

Sep 15, 2011

tunze

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

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...

View full post »

Thread 'Explain this asphalt sheen'

This problem is two parts. The first is to determine what effects are being provided by each of the elements - 1) the window panes; 2) the asphalt surface. My answer to that is The second part of the problem is exactly why you get this affect. And one more spoiler:

View full post »