Graph a vector, opposite to the given vector, that has an initial point at the origin.

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Author:James Stewart
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Chapter1: Functions And Models
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Graph a vector, opposite to the given vector, that has an initial point at the origin.

 

**Understanding Vectors on a Cartesian Plane**

In this section, we'll explore how to graph vectors on a Cartesian plane (xy-plane) and interpret their meaning. 

**Graph of a Vector:**

The image displays a Cartesian coordinate system with a vector represented by a red arrow.

### Description of the Graph:
1. **Axes:**
   - **Horizontal Axis (x-axis):** The x-axis is marked from -10 to 10.
   - **Vertical Axis (y-axis):** The y-axis is marked from -10 to 10.

2. **Vector:**
   - The vector starts from the origin (0,0) and points to the coordinate (5,7).

### Key Concepts:

1. **Vector Representation:**
   - A vector can be represented by its initial and terminal points. Here, it starts at (0,0) and ends at (5,7).
   - This vector can be denoted as **v** = (5, 7) in component form.

2. **Magnitude of the Vector:**
   - The magnitude (or length) of the vector can be calculated using the Pythagorean theorem:
     \[
     \| \mathbf{v} \| = \sqrt{5^2 + 7^2} = \sqrt{25 + 49} = \sqrt{74}
     \]
   - Therefore, the magnitude of the vector is \(\sqrt{74} \approx 8.6\).

3. **Direction of the Vector:**
   - The direction of a vector is given by the angle it makes with the positive x-axis. For this vector \( \mathbf{v} \), the angle \( \theta \) can be calculated using the tangent function:
     \[
     \theta = \tan^{-1}\left(\frac{7}{5}\right)
     \]
   - This, however, gives a conceptual understanding of the vector's direction.

This graph is useful in physics and engineering to visually represent vector quantities such as displacement, velocity, and force. By understanding how to plot and interpret vectors, students can gain a deeper insight into these fundamental concepts.
Transcribed Image Text:**Understanding Vectors on a Cartesian Plane** In this section, we'll explore how to graph vectors on a Cartesian plane (xy-plane) and interpret their meaning. **Graph of a Vector:** The image displays a Cartesian coordinate system with a vector represented by a red arrow. ### Description of the Graph: 1. **Axes:** - **Horizontal Axis (x-axis):** The x-axis is marked from -10 to 10. - **Vertical Axis (y-axis):** The y-axis is marked from -10 to 10. 2. **Vector:** - The vector starts from the origin (0,0) and points to the coordinate (5,7). ### Key Concepts: 1. **Vector Representation:** - A vector can be represented by its initial and terminal points. Here, it starts at (0,0) and ends at (5,7). - This vector can be denoted as **v** = (5, 7) in component form. 2. **Magnitude of the Vector:** - The magnitude (or length) of the vector can be calculated using the Pythagorean theorem: \[ \| \mathbf{v} \| = \sqrt{5^2 + 7^2} = \sqrt{25 + 49} = \sqrt{74} \] - Therefore, the magnitude of the vector is \(\sqrt{74} \approx 8.6\). 3. **Direction of the Vector:** - The direction of a vector is given by the angle it makes with the positive x-axis. For this vector \( \mathbf{v} \), the angle \( \theta \) can be calculated using the tangent function: \[ \theta = \tan^{-1}\left(\frac{7}{5}\right) \] - This, however, gives a conceptual understanding of the vector's direction. This graph is useful in physics and engineering to visually represent vector quantities such as displacement, velocity, and force. By understanding how to plot and interpret vectors, students can gain a deeper insight into these fundamental concepts.
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