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Find the component form of v given its magnitude and the angle it makes with the positive x-axis. Round your answer to four decimals.‖v‖=9,θ=150°

Question

Find the component form of v given its magnitude and the angle it makes with the positive x-axis. Round your answer to four decimals.‖v‖=9,θ=150°

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Solution

To find the component form of vector v, we can use the formulas:

v_x = ‖v‖ * cos(θ) v_y = ‖v‖ * sin(θ)

Given that ‖v‖ = 9 and θ = 150°, we first need to convert the angle from degrees to radians because the trigonometric functions in most programming languages use radians, not degrees.

1 radian = 180/π degrees So, 150 degrees = 150 * π/180 radians = 5π/6 radians

Now we can substitute ‖v‖ and θ into the formulas:

v_x = 9 * cos(5π/6) = -7.7942 v_y = 9 * sin(5π/6) = 4.5000

So, the component form of vector v is (-7.7942, 4.5000).

This problem has been solved

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To find the component form of the vector \(\mathbf{v}\) with a magnitude of 4 and a bearing of 125°, we need to convert the polar coordinates (magnitude and direction) into Cartesian coordinates (components along the \(i\) and \(j\) directions). 1. **Convert the bearing to a standard angle:** Bearings are measured clockwise from the north direction. A bearing of 125° means the angle is 125° clockwise from the north. To convert this to a standard angle (measured counterclockwise from the positive x-axis), we use: \[ \text{Standard angle} = 360° - 125° = 235° \] 2. **Calculate the components:** The components of the vector can be found using trigonometry: \[ v_x = v \cos(\theta) \] \[ v_y = v \sin(\theta) \] where \(v\) is the magnitude and \(\theta\) is the standard angle. Given: \[ v = 4, \quad \theta = 235° \] Converting 235° to radians: \[ \theta = 235° \times \frac{\pi}{180°} = \frac{235\pi}{180} \approx 4.1015 \text{ radians} \] Now, calculate the components: \[ v_x = 4 \cos(235°) = 4 \cos(4.1015) \approx 4 \times (-0.5736) \approx -2.29 \] \[ v_y = 4 \sin(235°) = 4 \sin(4.1015) \approx 4 \times (-0.8192) \approx -3.28 \] 3. **Write the vector in component form:** \[ \mathbf{v} = v_x \mathbf{i} + v_y \mathbf{j} = -2.29\mathbf{i} - 3.28\mathbf{j} \] Therefore, the correct answer is: \[ \boxed{E} \]

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