Math Problem Statement

Four vectors start at the origin of the x y axes labeled O. Vector A is directed along the negative y axis and has a length of 8.00 meters. Vector B is located in the first quadrant, it makes an angle of 30.0 degrees with the positive y axis and has a length of 15.0 meters. Vector C is located in the third quadrant, it makes an angle of 25.0 degrees with the negative x axis and has a length of 12.0 meters. Vector D is located in the second quadrant, it makes an angle of 53.0 degrees with the negative x axis and has a length of 10.0 meters. - Four vectors starting at the origin

Compute the x- and y-components of the vectors A⃗, B⃗, C⃗, and D⃗ in (Figure 1).

Express your answer in meters.

Solution

To find the xx- and yy-components of the vectors A\mathbf{A}, B\mathbf{B}, C\mathbf{C}, and D\mathbf{D}, we will use trigonometry. Each vector's components can be found using the following formulas:

  • For a vector with magnitude rr and angle θ\theta from the x-axis: x-component=rcos(θ)x \text{-component} = r \cos(\theta) y-component=rsin(θ)y \text{-component} = r \sin(\theta)

Given the directions and angles, let's break down each vector:

Vector A\mathbf{A}:

  • Length: 8.00 meters
  • Direction: Along the negative yy-axis
  • Angle: 270270^\circ (measured from the positive xx-axis)

Ax=8.00cos(270)=8.00×0=0.00 m\mathbf{A}_x = 8.00 \cos(270^\circ) = 8.00 \times 0 = 0.00 \text{ m} Ay=8.00sin(270)=8.00×(1)=8.00 m\mathbf{A}_y = 8.00 \sin(270^\circ) = 8.00 \times (-1) = -8.00 \text{ m}

Vector B\mathbf{B}:

  • Length: 15.0 meters
  • Direction: Makes a 30.030.0^\circ angle with the positive yy-axis
  • Angle: 9030=6090^\circ - 30^\circ = 60^\circ (relative to the positive xx-axis)

Bx=15.0cos(60)=15.0×0.5=7.50 m\mathbf{B}_x = 15.0 \cos(60^\circ) = 15.0 \times 0.5 = 7.50 \text{ m} By=15.0sin(60)=15.0×3212.99 m\mathbf{B}_y = 15.0 \sin(60^\circ) = 15.0 \times \frac{\sqrt{3}}{2} \approx 12.99 \text{ m}

Vector C\mathbf{C}:

  • Length: 12.0 meters
  • Direction: Makes a 25.025.0^\circ angle with the negative xx-axis
  • Angle: 180+25=205180^\circ + 25^\circ = 205^\circ (relative to the positive xx-axis)

Cx=12.0cos(205)=12.0×cos(205)10.88 m\mathbf{C}_x = 12.0 \cos(205^\circ) = 12.0 \times \cos(205^\circ) \approx -10.88 \text{ m} [ \mathbf{C}_y = 12.0 \sin(205^\circ) = 12.0 \times \sin(205^\circ) \approx -5.07 \text

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Math Problem Analysis

Mathematical Concepts

Trigonometry
Vectors

Formulas

x-component formula: r * cos(theta)
y-component formula: r * sin(theta)

Theorems

-

Suitable Grade Level

High School