You have already traveled 30 miles east and then 30 miles north. To get back to the start, you travel 30 miles west in 1 hour and then 30 miles south in a half hour. What are your average speed and average velocity for the whole rally? Explain your answer.

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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Question 1

You are participating in a road rally with your local classic car club. Speed is how fast an object moves, and velocity is the rate at which an object changes position.

Part A

You drive 30 miles due east in a half hour. Then, you turn left and drive 30 miles north in 1 hour. What are your average speed and velocity, and what are the rectangular and polar coordinates of your position? 

My answers for Part A were considered correct. (I have attached them as an image.)

 

Part B

You have already traveled 30 miles east and then 30 miles north. To get back to the start, you travel 30 miles west in 1 hour and then 30 miles south in a half hour. What are your average speed and average velocity for the whole rally? Explain your answer.

**I did not get Part B correct, so this is what I need help with. My result was an average speed of 45 mph, but this was incorrect."
 
Any help on Part B would be greatly appreciated.
 

 

**Summary:**

- **Avg. speed:** 40 miles/hour
- **Velocity:** 28.284 or 28 (rounded)
- **Rectangular Coordinates:** (30, 30)
- **Polar Coordinates:** \( \left(30\sqrt{2}, 45^\circ\right) \) and \( \left(30\sqrt{2}, \frac{\pi}{4}\right) \)

**Explanation:**

- **Average Speed:** Refers to the total distance traveled divided by the total time taken, hence 40 miles/hour.
- **Velocity:** Represents the speed of something in a given direction, calculated to be approximately 28.284, rounded to 28.
- **Rectangular Coordinates:** Refers to a point in a 2D space given as (30, 30), using the Cartesian coordinate system.
- **Polar Coordinates:** Represents the same point but in terms of distance from the origin and angle from the reference direction: 
  - The distance is \( 30\sqrt{2} \).
  - The angle can be represented in degrees as \( 45^\circ \) or in radians as \( \frac{\pi}{4} \).

Polar coordinates offer another way to express the location of points, particularly useful in fields like physics and engineering where radial symmetry is present.
Transcribed Image Text:**Summary:** - **Avg. speed:** 40 miles/hour - **Velocity:** 28.284 or 28 (rounded) - **Rectangular Coordinates:** (30, 30) - **Polar Coordinates:** \( \left(30\sqrt{2}, 45^\circ\right) \) and \( \left(30\sqrt{2}, \frac{\pi}{4}\right) \) **Explanation:** - **Average Speed:** Refers to the total distance traveled divided by the total time taken, hence 40 miles/hour. - **Velocity:** Represents the speed of something in a given direction, calculated to be approximately 28.284, rounded to 28. - **Rectangular Coordinates:** Refers to a point in a 2D space given as (30, 30), using the Cartesian coordinate system. - **Polar Coordinates:** Represents the same point but in terms of distance from the origin and angle from the reference direction: - The distance is \( 30\sqrt{2} \). - The angle can be represented in degrees as \( 45^\circ \) or in radians as \( \frac{\pi}{4} \). Polar coordinates offer another way to express the location of points, particularly useful in fields like physics and engineering where radial symmetry is present.
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