How Do Vector Components Relate in Orthogonal Projections and Cross Products?

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SUMMARY

The discussion focuses on the relationships between vector components in orthogonal projections and cross products, specifically proving the equations for normalized vectors a', b', and c' given the conditions of orthogonality and unit length. The proof establishes that a' can be expressed as (b x c)/(a•bxc), b' as (c x a)/(a•bxc), and c' as (a x b)/(a•bxc). Additionally, participants explore the directional relationships between these vectors, particularly the orientation of b x c with respect to a' and the length of b x c in terms of |a|, |a'|, and the angle between a and a'.

PREREQUISITES
  • Understanding of vector algebra and operations
  • Familiarity with orthogonal projections
  • Knowledge of cross products and dot products
  • Basic trigonometry and geometry concepts
NEXT STEPS
  • Study the properties of orthogonal vectors in vector spaces
  • Learn about the geometric interpretation of cross products
  • Explore the applications of vector projections in physics
  • Investigate the implications of vector normalization in 3D graphics
USEFUL FOR

Students and professionals in mathematics, physics, and engineering fields who are interested in vector analysis, particularly those studying mechanics or computer graphics.

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104. If a, b, c and a’, b’, c’ are such that
a’• a = b’• b = c’• c = 1
a’• b = a’• c = b’• a = b’• c = c’• a = c’ • b =0

Prove that it necessarily follows that
a^'= (b x c)/(a• bxc) , b^'= cxa/(a•bxc) ,
c^'= axb/(a•bxc)
 
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Try to figure out the direction of a' with respect to b and c. What will be the direction of bxc with respect to a'?
Now figure out the length of bxc using |a|, |a'| and the angle between a and a',
 

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