Concept explainers
(a)
The average speed of the person
(a)
Answer to Problem 9P
The average speed of the person is
Explanation of Solution
Given:
The number of complete laps
Distance of one lap,
Total time taken,
Formula used:
The average speed of the person is given by,
Here,
Calculation:
Convert the distance of one lap into meters.
The total distance travelled using equation (2) is,
Express the time taken in seconds.
Substitute the calculated values of
Conclusion:
Thus, the average speed of the person is
(b)
The average velocity of the person.
(b)
Answer to Problem 9P
The average velocity of the person is
Explanation of Solution
Given:
The number of complete laps
Distance of one lap,
Total time taken,
Formula used:
The average velocity of the person is given by,
Calculation:
Displacement is the shortest distance between the starting and the ending point of the body’s motion. When the jogger completes a lap, he returns to exactly the same position he was when he had started. Therefore, at the end of 8 laps, the final and the initial positions of the jogger are the same.
Since displacement is defined as the difference between the body’s initial and final positions, the jogger’s displacement at the end of 8 laps is zero.
Hence, the jogger’s velocity at the end of 8 laps is also zero.
Conclusion:
Thus, the average velocity of the person is
Chapter 2 Solutions
Physics: Principles with Applications
Additional Science Textbook Solutions
College Physics (10th Edition)
University Physics Volume 2
Tutorials in Introductory Physics
Essential University Physics: Volume 2 (3rd Edition)
University Physics with Modern Physics (14th Edition)
Conceptual Integrated Science
- College PhysicsPhysicsISBN:9781305952300Author:Raymond A. Serway, Chris VuillePublisher:Cengage LearningUniversity Physics (14th Edition)PhysicsISBN:9780133969290Author:Hugh D. Young, Roger A. FreedmanPublisher:PEARSONIntroduction To Quantum MechanicsPhysicsISBN:9781107189638Author:Griffiths, David J., Schroeter, Darrell F.Publisher:Cambridge University Press
- Physics for Scientists and EngineersPhysicsISBN:9781337553278Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningLecture- Tutorials for Introductory AstronomyPhysicsISBN:9780321820464Author:Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina BrissendenPublisher:Addison-WesleyCollege Physics: A Strategic Approach (4th Editio...PhysicsISBN:9780134609034Author:Randall D. Knight (Professor Emeritus), Brian Jones, Stuart FieldPublisher:PEARSON