The new Ninth Edition of Halliday, Resnick and Walkers Principles of Physics has been strategically revised to focus on engaging students, supporting critical thinking and moving students to the next level of physics understanding. Key to the Ninth Edition's support for critical thinking and development of understanding physics concepts is Jearl Walker's modern voice. Jearl Walker is both an active teacher, who understands the challenges faced in today's classroom, and a world renowned communicator of science to the general public. His Flying Circus of Physics is a cult classic among physics students and instructors and material from this book is integrated throughout the Ninth Edition to catch students' attention, engage them, and encourage them to solve the underlying real world physics phenomenon and concepts, before they begin the more quantitative portion of the content or problem. Succeed with WileyPLUS This online teaching and learning environment integrates the entire digital textbook with the most effective instructor and student resources to fit every learning style. WileyPLUS' industry-leading service offerings provide all the help, resources and personal support you need: Students achieve concept mastery in a rich structured environment that's available 24/7. Context-sensitive help in the form of direct links to the online text, hints, solutions, and tutorials - right from the online book. Immediate feedback on self-assessment and homework with the ability to track progress. Integrated, multi-media resources provide multiple study-paths to fit every students learning style. Principles of Physics Extended, 9th Edition (ISV) is available in the following parts: Principles of Physics, 9th Edition, Regular Version (Ch 1-37) ISBN 9780470524633 Principles of Physics, 9th Edition,Extended Version (Ch 1-44) ISBN 9780470561584 Principles of Physics, 9th Edition,Vol. 1 (Ch 1-20). ISBN 9780470568378 Principles of Physics, 9th Edition, Vol. 2 (Ch 21-44) ISBN 9780470568361