The angle that A makes with the positive x axis

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Homework Help Overview

The discussion revolves around finding the angle that a vector A, represented as 2i - 10k, makes with the positive x-axis. The context is rooted in vector mathematics and trigonometry.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • The original poster considers whether to define the x-axis as the vector i and questions the use of the dot product and cross product in their approach. Some participants suggest using inverse tangent for the angle calculation, while others inquire about the dimensionality of the problem.

Discussion Status

The discussion is active, with participants exploring different interpretations of the problem. There is a suggestion that the question is straightforward despite its three-dimensional nature, indicating a potential for productive dialogue.

Contextual Notes

Participants are navigating the complexities of three-dimensional vector analysis, and there may be assumptions about the familiarity with trigonometric functions and vector operations that are not explicitly stated.

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A=2i-10k

give the angle that A makes with the positive x-axis ?


do i need to make x axis=i and i go A.B/AxB ?
 
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You have short sides of a triangle, you want the inverse tangent, see:

http://math12.vln.dreamhosters.com/wiki/Modeling_Real_World_Situations_Using_Trigonometric_Functions#Tangent_of_Theta
 
Last edited by a moderator:
Is this 3-dimesional question?
 
tebes said:
Is this 3-dimesional question?
It is. But don't be put off, because it's actually an easy 3D question. :smile:
 

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