Thornton & Marion, Classical Dynamics of Particles and Systems, 5th Edition
Chapter 1. Matrices, Vectors, and Vector Calculus
Problem 07. Scalar Product of two (unit) vectors
The problem asks you to
- Find the vectors describing the diagonals
- The angle between diagonal vectors
This problem assumes
- A unit cube in the Cartesian (Rectangular) coordinate system
We should know about
- Position vectors
- Scalar Product of vectors
Solution
1) Find diagonal vectors
First, we can define the vector $latex \\vec{A}$ from the origin to (1,1,1). And, we can also define the vector $latex \\vec{B}$ from (0,0,1) to (1,1,0). Thus, a pair of diagonal vectors can be expressed as
From the scalar product,
Since,
Therefore,
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