College Physics
1st Edition
ISBN:9781938168000
Author:Paul Peter Urone, Roger Hinrichs
Publisher:Paul Peter Urone, Roger Hinrichs
Chapter6: Uniform Circular Motion And Gravitation
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Problem 47PE: Astronomical observations of our Milky Way galaxy indicate that it has a mass of about 8.1011 solar...
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![### Polar Coordinates Distance Calculation
**Problem Statement:**
Two plane polar coordinates have the coordinates \((2.2, 48.3^\circ)\) and \((4.6, 10.5^\circ)\). Calculate the distance between them. Round your answer to 1 decimal place.
**Detailed Explanation:**
In polar coordinates, a point in the plane is represented as \((r, \theta)\), where:
- \(r\) is the radial distance from the origin.
- \(\theta\) is the angular coordinate (or angle) in degrees.
To find the distance \(d\) between two points \((r_1, \theta_1)\) and \((r_2, \theta_2)\) in polar coordinates, you can use the formula:
\[ d = \sqrt{r_1^2 + r_2^2 - 2 r_1 r_2 \cos(\theta_2 - \theta_1)} \]
1. For the coordinates \((r_1, \theta_1) = (2.2, 48.3^\circ)\):
- \(r_1 = 2.2\)
- \(\theta_1 = 48.3^\circ\)
2. For the coordinates \((r_2, \theta_2) = (4.6, 10.5^\circ)\):
- \(r_2 = 4.6\)
- \(\theta_2 = 10.5^\circ\)
Convert the angular difference \((\theta_2 - \theta_1)\) to radians if necessary, or use the cosine of the difference directly in degrees:
\[ \cos((\theta_2 - \theta_1)^\circ) = \cos(10.5^\circ - 48.3^\circ) \]
Then, substitute the values into the formula to compute the distance \(d\).
**Note for Educational Websites:**
- Ensure that students understand how to convert between degrees and radians if needed.
- Explain the cosine function and its significance in the formula.
- Provide step-by-step calculations and intermediate results to enhance understanding.
Remember to use appropriate mathematical notation and clarify each step for better readability and comprehension.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ff3b22dc5-b81c-452b-a8fe-ec73685697af%2Ff6de1451-edd9-4fb1-9317-91d862fbd41a%2Ftig1tve.jpeg&w=3840&q=75)
Transcribed Image Text:### Polar Coordinates Distance Calculation
**Problem Statement:**
Two plane polar coordinates have the coordinates \((2.2, 48.3^\circ)\) and \((4.6, 10.5^\circ)\). Calculate the distance between them. Round your answer to 1 decimal place.
**Detailed Explanation:**
In polar coordinates, a point in the plane is represented as \((r, \theta)\), where:
- \(r\) is the radial distance from the origin.
- \(\theta\) is the angular coordinate (or angle) in degrees.
To find the distance \(d\) between two points \((r_1, \theta_1)\) and \((r_2, \theta_2)\) in polar coordinates, you can use the formula:
\[ d = \sqrt{r_1^2 + r_2^2 - 2 r_1 r_2 \cos(\theta_2 - \theta_1)} \]
1. For the coordinates \((r_1, \theta_1) = (2.2, 48.3^\circ)\):
- \(r_1 = 2.2\)
- \(\theta_1 = 48.3^\circ\)
2. For the coordinates \((r_2, \theta_2) = (4.6, 10.5^\circ)\):
- \(r_2 = 4.6\)
- \(\theta_2 = 10.5^\circ\)
Convert the angular difference \((\theta_2 - \theta_1)\) to radians if necessary, or use the cosine of the difference directly in degrees:
\[ \cos((\theta_2 - \theta_1)^\circ) = \cos(10.5^\circ - 48.3^\circ) \]
Then, substitute the values into the formula to compute the distance \(d\).
**Note for Educational Websites:**
- Ensure that students understand how to convert between degrees and radians if needed.
- Explain the cosine function and its significance in the formula.
- Provide step-by-step calculations and intermediate results to enhance understanding.
Remember to use appropriate mathematical notation and clarify each step for better readability and comprehension.
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