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PO 5Aug-9781118486894-97811193 x + Smartwings Tracking sheet June- A Google Docs Offline - Chrome W X + O File | C:/Users/HP/Downloads/5Aug-9781118486894-9781119394112-Physics%20by%20David%20Young,%20Shane%20Stadler.pdf 68 of 994 ++ A' Read aloud Draw O Erase 8. An 18-year-old runner can complete a 10.0-km course with an average speed of 4.39 m/s. A 50-year-old runner can cover the same dis- tance with an average speed of 4.27 m/s. How much later (in seconds) should the younger runner start in order to finish the course at the same time as the older runner? 16. Over a time interval of 2.16 years, the velocity of a planet orbiting a distant star reverses direction, changing from +20.9 km/s to – 18.5 km/s. Find (a) the total change in the planet's velocity (in m/s) and (b) its average acceleration (in m/s²) during this interval. Include the correct algebraic sign with your answers to convey the directions of the velocity and the acceleration. 9. A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 4.0 m/s. The car is a distance d away. The bear is 26 m behind the tourist and running at 6.0 m/s. The tourist reaches the car safely. What is the maximum possible value for d? 17. ssm A motorcycle has velocity and acceleration of the motorcycle point in the same direction. How much time is required for the motorcycle to change its speed from (a) 21 to 31 m/s, and (b) 51 to 61 m/s? constant acceleration of 2.5 m/s². Both the *10. D In reaching her destination, a backpacker walks with an average velocity of 1.34 m/s, due west. This average velocity results because she hikes for 6.44 km with an average velocity of 2.68 m/s, due west, turns around, and hikes with an average velocity of 0.447 m/s, due east. How far east did she walk? 18. A sprinter explodes out of the starting block with an acceleration of +2.3 m/s², which she sustains for 1.2 s. Then, her acceleration drops to zero for the rest of the race. What is her velocity (a) at t = 1.2 s and (b) at the end of the race? 19. Go The initial velocity and acceleration of four moving objects at a given instant in time are given in the following table. Determine the final speed of each of the objects, assuming that the time elapsed since t = 0 s is 2.0 s. *11. ssm A bicyclist makes a trip that consists of three parts, each in the same direction (due north) along a straight road. During the first part, she rides for 22 minutes at an average speed of 7.2 m/s. During the second part, she rides for 36 minutes at an average speed of 5.1 m/s. Finally, dur- ing the third part, she rides for 8.0 minutes at an average speed of 13 m/s. (a) How far has the bicyclist traveled during the entire trip? (b) What is her average velocity for the trip? *12. D A car makes a trip due north for three-fourths of the time and due south one-fourth of the time. The average northward velocity has a magnitude of 27 m/s, and the average southward velocity has a magni- tude of 17 m/s. What is the average velocity (magnitude and direction) for the entire trip? Initial velocity Vo Acceleration a (a) +12 m/s +3.0 m/s² (b) +12 m/s -3.0 m/s² - 12 m/s - 12 m/s (c) +3.0 m/s² (d) -3.0 m/s² **13. You are on a train that is traveling at 3.0 m/s along a level straight track. Very near and parallel to the track is a wall that slopes upward at a 12° angle with the horizontal. As you face the window (0.90 m high, 2.0 m wide) in your compartment, the train is moving to the left, as the drawing indicates. The top edge of the wall first appears at window cor- ner A and eventually disappears at window corner B. How much time passes between appearance and disappearance of the upper edge of the wall? 20. ao An Australian emu is running due north in a straight line at a speed of 13.0 m/s and slows down to a speed of 10.6 m/s in 4.0 s. (a) What is the direction of the bird's acceleration? (b) Assuming that the acceleration remains the same, what is the bird's velocity after an additional 2.0 s has elapsed? 21. ssm For a standard production car, the highest road-tested accelera- tion ever reported occurred in 1993, when a Ford RS200 Evolution went from zero to 26.8 m/s (60 mi/h) in 3.275 s. Find the magnitude of the 3.0 m/s car's acceleration. B B *22. mmh A car is traveling along a straight road at a velocity of +36.0 m/s when its cnginc cuts out. For the next twelve seconds the car slows down 23:39 O Type here to search Ca A) ENG 15-08-2020 (1 近

PO 5Aug-9781118486894-97811193 x + Smartwings Tracking sheet June- A Google Docs Offline - Chrome W X + O File | C:/Users/HP/Downloads/5Aug-9781118486894-9781119394112-Physics%20by%20David%20Young,%20Shane%20Stadler.pdf 68 of 994 ++ A' Read aloud Draw O Erase 8. An 18-year-old runner can complete a 10.0-km course with an average speed of 4.39 m/s. A 50-year-old runner can cover the same dis- tance with an average speed of 4.27 m/s. How much later (in seconds) should the younger runner start in order to finish the course at the same time as the older runner? 16. Over a time interval of 2.16 years, the velocity of a planet orbiting a distant star reverses direction, changing from +20.9 km/s to – 18.5 km/s. Find (a) the total change in the planet's velocity (in m/s) and (b) its average acceleration (in m/s²) during this interval. Include the correct algebraic sign with your answers to convey the directions of the velocity and the acceleration. 9. A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 4.0 m/s. The car is a distance d away. The bear is 26 m behind the tourist and running at 6.0 m/s. The tourist reaches the car safely. What is the maximum possible value for d? 17. ssm A motorcycle has velocity and acceleration of the motorcycle point in the same direction. How much time is required for the motorcycle to change its speed from (a) 21 to 31 m/s, and (b) 51 to 61 m/s? constant acceleration of 2.5 m/s². Both the *10. D In reaching her destination, a backpacker walks with an average velocity of 1.34 m/s, due west. This average velocity results because she hikes for 6.44 km with an average velocity of 2.68 m/s, due west, turns around, and hikes with an average velocity of 0.447 m/s, due east. How far east did she walk? 18. A sprinter explodes out of the starting block with an acceleration of +2.3 m/s², which she sustains for 1.2 s. Then, her acceleration drops to zero for the rest of the race. What is her velocity (a) at t = 1.2 s and (b) at the end of the race? 19. Go The initial velocity and acceleration of four moving objects at a given instant in time are given in the following table. Determine the final speed of each of the objects, assuming that the time elapsed since t = 0 s is 2.0 s. *11. ssm A bicyclist makes a trip that consists of three parts, each in the same direction (due north) along a straight road. During the first part, she rides for 22 minutes at an average speed of 7.2 m/s. During the second part, she rides for 36 minutes at an average speed of 5.1 m/s. Finally, dur- ing the third part, she rides for 8.0 minutes at an average speed of 13 m/s. (a) How far has the bicyclist traveled during the entire trip? (b) What is her average velocity for the trip? *12. D A car makes a trip due north for three-fourths of the time and due south one-fourth of the time. The average northward velocity has a magnitude of 27 m/s, and the average southward velocity has a magni- tude of 17 m/s. What is the average velocity (magnitude and direction) for the entire trip? Initial velocity Vo Acceleration a (a) +12 m/s +3.0 m/s² (b) +12 m/s -3.0 m/s² - 12 m/s - 12 m/s (c) +3.0 m/s² (d) -3.0 m/s² **13. You are on a train that is traveling at 3.0 m/s along a level straight track. Very near and parallel to the track is a wall that slopes upward at a 12° angle with the horizontal. As you face the window (0.90 m high, 2.0 m wide) in your compartment, the train is moving to the left, as the drawing indicates. The top edge of the wall first appears at window cor- ner A and eventually disappears at window corner B. How much time passes between appearance and disappearance of the upper edge of the wall? 20. ao An Australian emu is running due north in a straight line at a speed of 13.0 m/s and slows down to a speed of 10.6 m/s in 4.0 s. (a) What is the direction of the bird's acceleration? (b) Assuming that the acceleration remains the same, what is the bird's velocity after an additional 2.0 s has elapsed? 21. ssm For a standard production car, the highest road-tested accelera- tion ever reported occurred in 1993, when a Ford RS200 Evolution went from zero to 26.8 m/s (60 mi/h) in 3.275 s. Find the magnitude of the 3.0 m/s car's acceleration. B B *22. mmh A car is traveling along a straight road at a velocity of +36.0 m/s when its cnginc cuts out. For the next twelve seconds the car slows down 23:39 O Type here to search Ca A) ENG 15-08-2020 (1 近

College Physics
College Physics
1st Edition
ISBN:9781938168000
Author:Paul Peter Urone, Roger Hinrichs
Publisher:Paul Peter Urone, Roger Hinrichs
Chapter7: Work, Energy, And Energy Resources
Section: Chapter Questions
Problem 31PE: Suppose a star 1000 times brighter than our Sun (that is, emitting 1000 times the power) suddenly...
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PO 5Aug-9781118486894-97811193 x + Smartwings Tracking sheet June- A Google Docs Offline - Chrome W X + O File | C:/Users/HP/Downloads/5Aug-9781118486894-9781119394112-Physics%20by%20David%20Young,%20Shane%20Stadler.pdf 68 of 994 ++ A' Read aloud Draw O Erase 8. An 18-year-old runner can complete a 10.0-km course with an average speed of 4.39 m/s. A 50-year-old runner can cover the same dis- tance with an average speed of 4.27 m/s. How much later (in seconds) should the younger runner start in order to finish the course at the same time as the older runner? 16. Over a time interval of 2.16 years, the velocity of a planet orbiting a distant star reverses direction, changing from +20.9 km/s to – 18.5 km/s. Find (a) the total change in the planet's velocity (in m/s) and (b) its average acceleration (in m/s²) during this interval. Include the correct algebraic sign with your answers to convey the directions of the velocity and the acceleration. 9. A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 4.0 m/s. The car is a distance d away. The bear is 26 m behind the tourist and running at 6.0 m/s. The tourist reaches the car safely. What is the maximum possible value for d? 17. ssm A motorcycle has velocity and acceleration of the motorcycle point in the same direction. How much time is required for the motorcycle to change its speed from (a) 21 to 31 m/s, and (b) 51 to 61 m/s? constant acceleration of 2.5 m/s². Both the *10. D In reaching her destination, a backpacker walks with an average velocity of 1.34 m/s, due west. This average velocity results because she hikes for 6.44 km with an average velocity of 2.68 m/s, due west, turns around, and hikes with an average velocity of 0.447 m/s, due east. How far east did she walk? 18. A sprinter explodes out of the starting block with an acceleration of +2.3 m/s², which she sustains for 1.2 s. Then, her acceleration drops to zero for the rest of the race. What is her velocity (a) at t = 1.2 s and (b) at the end of the race? 19. Go The initial velocity and acceleration of four moving objects at a given instant in time are given in the following table. Determine the final speed of each of the objects, assuming that the time elapsed since t = 0 s is 2.0 s. *11. ssm A bicyclist makes a trip that consists of three parts, each in the same direction (due north) along a straight road. During the first part, she rides for 22 minutes at an average speed of 7.2 m/s. During the second part, she rides for 36 minutes at an average speed of 5.1 m/s. Finally, dur- ing the third part, she rides for 8.0 minutes at an average speed of 13 m/s. (a) How far has the bicyclist traveled during the entire trip? (b) What is her average velocity for the trip? *12. D A car makes a trip due north for three-fourths of the time and due south one-fourth of the time. The average northward velocity has a magnitude of 27 m/s, and the average southward velocity has a magni- tude of 17 m/s. What is the average velocity (magnitude and direction) for the entire trip? Initial velocity Vo Acceleration a (a) +12 m/s +3.0 m/s² (b) +12 m/s -3.0 m/s² - 12 m/s - 12 m/s (c) +3.0 m/s² (d) -3.0 m/s² **13. You are on a train that is traveling at 3.0 m/s along a level straight track. Very near and parallel to the track is a wall that slopes upward at a 12° angle with the horizontal. As you face the window (0.90 m high, 2.0 m wide) in your compartment, the train is moving to the left, as the drawing indicates. The top edge of the wall first appears at window cor- ner A and eventually disappears at window corner B. How much time passes between appearance and disappearance of the upper edge of the wall? 20. ao An Australian emu is running due north in a straight line at a speed of 13.0 m/s and slows down to a speed of 10.6 m/s in 4.0 s. (a) What is the direction of the bird's acceleration? (b) Assuming that the acceleration remains the same, what is the bird's velocity after an additional 2.0 s has elapsed? 21. ssm For a standard production car, the highest road-tested accelera- tion ever reported occurred in 1993, when a Ford RS200 Evolution went from zero to 26.8 m/s (60 mi/h) in 3.275 s. Find the magnitude of the 3.0 m/s car's acceleration. B B *22. mmh A car is traveling along a straight road at a velocity of +36.0 m/s when its cnginc cuts out. For the next twelve seconds the car slows down 23:39 O Type here to search Ca A) ENG 15-08-2020 (1 近
Transcribed Image Text:PO 5Aug-9781118486894-97811193 x + Smartwings Tracking sheet June- A Google Docs Offline - Chrome W X + O File | C:/Users/HP/Downloads/5Aug-9781118486894-9781119394112-Physics%20by%20David%20Young,%20Shane%20Stadler.pdf 68 of 994 ++ A' Read aloud Draw O Erase 8. An 18-year-old runner can complete a 10.0-km course with an average speed of 4.39 m/s. A 50-year-old runner can cover the same dis- tance with an average speed of 4.27 m/s. How much later (in seconds) should the younger runner start in order to finish the course at the same time as the older runner? 16. Over a time interval of 2.16 years, the velocity of a planet orbiting a distant star reverses direction, changing from +20.9 km/s to – 18.5 km/s. Find (a) the total change in the planet's velocity (in m/s) and (b) its average acceleration (in m/s²) during this interval. Include the correct algebraic sign with your answers to convey the directions of the velocity and the acceleration. 9. A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 4.0 m/s. The car is a distance d away. The bear is 26 m behind the tourist and running at 6.0 m/s. The tourist reaches the car safely. What is the maximum possible value for d? 17. ssm A motorcycle has velocity and acceleration of the motorcycle point in the same direction. How much time is required for the motorcycle to change its speed from (a) 21 to 31 m/s, and (b) 51 to 61 m/s? constant acceleration of 2.5 m/s². Both the *10. D In reaching her destination, a backpacker walks with an average velocity of 1.34 m/s, due west. This average velocity results because she hikes for 6.44 km with an average velocity of 2.68 m/s, due west, turns around, and hikes with an average velocity of 0.447 m/s, due east. How far east did she walk? 18. A sprinter explodes out of the starting block with an acceleration of +2.3 m/s², which she sustains for 1.2 s. Then, her acceleration drops to zero for the rest of the race. What is her velocity (a) at t = 1.2 s and (b) at the end of the race? 19. Go The initial velocity and acceleration of four moving objects at a given instant in time are given in the following table. Determine the final speed of each of the objects, assuming that the time elapsed since t = 0 s is 2.0 s. *11. ssm A bicyclist makes a trip that consists of three parts, each in the same direction (due north) along a straight road. During the first part, she rides for 22 minutes at an average speed of 7.2 m/s. During the second part, she rides for 36 minutes at an average speed of 5.1 m/s. Finally, dur- ing the third part, she rides for 8.0 minutes at an average speed of 13 m/s. (a) How far has the bicyclist traveled during the entire trip? (b) What is her average velocity for the trip? *12. D A car makes a trip due north for three-fourths of the time and due south one-fourth of the time. The average northward velocity has a magnitude of 27 m/s, and the average southward velocity has a magni- tude of 17 m/s. What is the average velocity (magnitude and direction) for the entire trip? Initial velocity Vo Acceleration a (a) +12 m/s +3.0 m/s² (b) +12 m/s -3.0 m/s² - 12 m/s - 12 m/s (c) +3.0 m/s² (d) -3.0 m/s² **13. You are on a train that is traveling at 3.0 m/s along a level straight track. Very near and parallel to the track is a wall that slopes upward at a 12° angle with the horizontal. As you face the window (0.90 m high, 2.0 m wide) in your compartment, the train is moving to the left, as the drawing indicates. The top edge of the wall first appears at window cor- ner A and eventually disappears at window corner B. How much time passes between appearance and disappearance of the upper edge of the wall? 20. ao An Australian emu is running due north in a straight line at a speed of 13.0 m/s and slows down to a speed of 10.6 m/s in 4.0 s. (a) What is the direction of the bird's acceleration? (b) Assuming that the acceleration remains the same, what is the bird's velocity after an additional 2.0 s has elapsed? 21. ssm For a standard production car, the highest road-tested accelera- tion ever reported occurred in 1993, when a Ford RS200 Evolution went from zero to 26.8 m/s (60 mi/h) in 3.275 s. Find the magnitude of the 3.0 m/s car's acceleration. B B *22. mmh A car is traveling along a straight road at a velocity of +36.0 m/s when its cnginc cuts out. For the next twelve seconds the car slows down 23:39 O Type here to search Ca A) ENG 15-08-2020 (1 近
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