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Ch. 7 - Applications of Trigonometry and Vectors
Lial - Trigonometry 12th Edition
Lial12th EditionTrigonometryISBN: 9780136552161, 9780135440780, 9780136881117, 9780135440827, 9780135924891Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoLial 12th EditionCh. 7 - Applications of Trigonometry and VectorsProblema 31b
Capitolo 8, Problema 31b

Use the figure to find each vector: u - v. Use vector notation as in Example 4.


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Identify the components of vectors \( \mathbf{u} \) and \( \mathbf{v} \) from the figure. Typically, each vector can be expressed in component form as \( \mathbf{u} = \langle u_x, u_y \rangle \) and \( \mathbf{v} = \langle v_x, v_y \rangle \), where \( u_x \) and \( u_y \) are the horizontal and vertical components of \( \mathbf{u} \), and similarly for \( \mathbf{v} \).
Recall that vector subtraction \( \mathbf{u} - \mathbf{v} \) is performed by subtracting the corresponding components of \( \mathbf{v} \) from \( \mathbf{u} \). This means \( \mathbf{u} - \mathbf{v} = \langle u_x - v_x, u_y - v_y \rangle \).
Calculate the horizontal component of \( \mathbf{u} - \mathbf{v} \) by subtracting the horizontal component of \( \mathbf{v} \) from that of \( \mathbf{u} \): \( u_x - v_x \).
Calculate the vertical component of \( \mathbf{u} - \mathbf{v} \) by subtracting the vertical component of \( \mathbf{v} \) from that of \( \mathbf{u} \): \( u_y - v_y \).
Write the resulting vector in component form as \( \mathbf{u} - \mathbf{v} = \langle u_x - v_x, u_y - v_y \rangle \), which is the vector notation requested.

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Vector Representation and Notation

Vectors are quantities with both magnitude and direction, often represented as arrows or ordered pairs. Vector notation typically uses angle brackets, such as u = <x, y>, to denote components along coordinate axes. Understanding this notation is essential for performing vector operations accurately.
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i & j Notation

Vector Subtraction

Vector subtraction involves finding the difference between two vectors by subtracting their corresponding components. If u = <u₁, u₂> and v = <v₁, v₂>, then u - v = <u₁ - v₁, u₂ - v₂>. This operation results in a new vector representing the displacement from v to u.
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Adding Vectors Geometrically

Graphical Interpretation of Vectors

Vectors can be visualized graphically as arrows in the coordinate plane, where subtraction corresponds to placing the tail of one vector at the head of another and drawing the resultant vector. This helps in understanding the direction and magnitude of the resulting vector from u - v.
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Finding Direction of a Vector Example 1
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