Table of contents
- 0. Review of College Algebra4h 43m
- 1. Measuring Angles39m
- 2. Trigonometric Functions on Right Triangles2h 5m
- 3. Unit Circle1h 19m
- 4. Graphing Trigonometric Functions1h 19m
- 5. Inverse Trigonometric Functions and Basic Trigonometric Equations1h 41m
- 6. Trigonometric Identities and More Equations2h 34m
- 7. Non-Right Triangles1h 38m
- 8. Vectors2h 25m
- 9. Polar Equations2h 5m
- 10. Parametric Equations1h 6m
- 11. Graphing Complex Numbers1h 7m
8. Vectors
Geometric Vectors
Problem 7.54
Textbook Question
A plane flies 650 mph on a bearing of 175.3°. A 25-mph wind, from a direction of 266.6°, blows against the plane. Find the resulting bearing of the plane.
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1
Convert the plane's bearing and the wind's direction from degrees to radians for calculation purposes. Use the formula \( \text{radians} = \text{degrees} \times \frac{\pi}{180} \).
Determine the components of the plane's velocity vector and the wind's velocity vector. Use the formulas \( V_x = V \cos(\theta) \) and \( V_y = V \sin(\theta) \), where \( V \) is the speed and \( \theta \) is the angle in radians.
Calculate the resultant velocity vector by adding the components of the plane's velocity vector and the wind's velocity vector. Use \( V_{rx} = V_{px} + V_{wx} \) and \( V_{ry} = V_{py} + V_{wy} \).
Compute the magnitude of the resultant velocity vector using the Pythagorean theorem: \( V_r = \sqrt{V_{rx}^2 + V_{ry}^2} \).
Find the resultant bearing of the plane by calculating the angle of the resultant velocity vector. Use the formula \( \theta_r = \tan^{-1}(\frac{V_{ry}}{V_{rx}}) \) and convert the angle from radians back to degrees.
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