Find i x j and i · (j × k). Give a geometric interpretation of both quantities.

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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**Question 1.** Find **i × j** and **i · (j × k)**. Give a geometric interpretation of both quantities.

**Explanation:**

1. **i × j:**
   - The cross product **i × j** results in vector **k**. This is because **i**, **j**, and **k** are unit vectors along the x, y, and z axes, respectively, in a right-handed coordinate system. The cross product of any two unit vectors in this system results in the third.

2. **i · (j × k):**
   - The expression **j × k** results in vector **i** (based on the cyclic nature of unit vectors in a right-handed coordinate system).
   - The dot product **i · i** equals 1 because the dot product of a vector with itself equals the square of its magnitude, and a unit vector has a magnitude of 1.

**Geometric Interpretation:**

- **i × j = k** implies that the cross product of two perpendicular vectors in a plane gives a vector perpendicular to that plane (along the z-axis in this context).

- **i · (j × k) = 1** indicates that the volume of the parallelepiped formed by vectors **i**, **j**, and **k** is 1, which geometrically represents the scalar triple product and confirms the orthogonality and unit length of these vectors.
Transcribed Image Text:**Question 1.** Find **i × j** and **i · (j × k)**. Give a geometric interpretation of both quantities. **Explanation:** 1. **i × j:** - The cross product **i × j** results in vector **k**. This is because **i**, **j**, and **k** are unit vectors along the x, y, and z axes, respectively, in a right-handed coordinate system. The cross product of any two unit vectors in this system results in the third. 2. **i · (j × k):** - The expression **j × k** results in vector **i** (based on the cyclic nature of unit vectors in a right-handed coordinate system). - The dot product **i · i** equals 1 because the dot product of a vector with itself equals the square of its magnitude, and a unit vector has a magnitude of 1. **Geometric Interpretation:** - **i × j = k** implies that the cross product of two perpendicular vectors in a plane gives a vector perpendicular to that plane (along the z-axis in this context). - **i · (j × k) = 1** indicates that the volume of the parallelepiped formed by vectors **i**, **j**, and **k** is 1, which geometrically represents the scalar triple product and confirms the orthogonality and unit length of these vectors.
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