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
3. Unit Circle
Defining the Unit Circle
Problem 3.21a
Textbook Question
Textbook QuestionUse the formula v = r ω to find the value of the missing variable.
r = 12 m , ω = 2π/3 radians per sec
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Angular Velocity (ω)
Angular velocity (ω) measures how quickly an object rotates around a central point, expressed in radians per second. It indicates the angle covered per unit of time, allowing us to understand the rotational speed of an object. In this question, ω is given as 2π/3 radians per second, which is essential for calculating linear velocity.
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Radius (r)
The radius (r) is the distance from the center of a circle to any point on its circumference. In the context of circular motion, the radius plays a crucial role in determining the linear velocity of an object moving along a circular path. Here, the radius is provided as 12 meters, which is necessary for applying the formula v = rω.
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Linear Velocity (v)
Linear velocity (v) represents the speed of an object moving along a circular path and is calculated using the formula v = rω. This formula shows that linear velocity is directly proportional to both the radius and the angular velocity. By substituting the given values of r and ω into this formula, we can find the missing variable, which is the linear velocity.
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