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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
Capitolo 8, Problema 29b

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


Graph showing vectors u and v originating from the origin, with u pointing up-right and v pointing down-right on an xy-grid.

Guida verificata passo dopo passo
1
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 \( \mathbf{u} \), respectively, and similarly for \( \mathbf{v} \).
Write down the subtraction operation for vectors: \( \mathbf{u} - \mathbf{v} = \langle u_x - v_x, u_y - v_y \rangle \). This means you subtract the corresponding components of \( \mathbf{v} \) from \( \mathbf{u} \).
Calculate the difference of the horizontal components: subtract \( v_x \) from \( u_x \) to find the \( x \)-component of \( \mathbf{u} - \mathbf{v} \).
Calculate the difference of the vertical components: subtract \( v_y \) from \( u_y \) to find the \( y \)-component of \( \mathbf{u} - \mathbf{v} \).
Express the resulting vector in vector notation as \( \mathbf{u} - \mathbf{v} = \langle u_x - v_x, u_y - v_y \rangle \). This is the vector difference you were asked to find.

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Vector Subtraction

Vector subtraction involves finding the difference between two vectors by reversing the direction of the vector to be subtracted and then adding it to the first vector. Algebraically, u - v is equivalent to u + (-v), where -v is the vector v with its direction reversed.
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Adding Vectors Geometrically

Vector Notation

Vector notation typically represents vectors as ordered pairs or components, such as u = <x, y>. This notation allows for straightforward arithmetic operations like addition and subtraction by working component-wise, which is essential for expressing the result of u - v clearly.
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Graphical Representation of Vectors

Vectors can be represented graphically as directed line segments with magnitude and direction. Understanding how to visualize vector subtraction on a graph helps in interpreting the problem and verifying the algebraic result by drawing vectors u, v, and u - v accordingly.
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Finding Direction of a Vector Example 1