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เนื้อหาย่อ : To the Student As you begin the study of engineering no doubt you are filled with enthusiasm, curiosity, and a desire to succeed. Your first year will be spent primarily in establishing a solid foundation in mathematics, basic sciences, and communica- tions. Also, you will be introduced to selected engineering topics that will dem- onstrate how engineers approach problem solving, arrive at correct solutions, and interface with other engineering professionals and the general public to implement the solutions. You will see how mathematics, science, and commu- nications provide the means to solve problems and convey the solutions in a manner that can be clearly understood and quickly verified by the appropriate persons. You will quickly discover the need for more in-depth study in many engineering subjects in order to solve increasingly complex problems. As authors, we believe the material presented in this book will provide you with a fundamental understanding of how engineers function in today's technologi- cal world. After your study of topics in this text, we believe you will be eager to enter the advanced engineering subjects in your chosen discipline, confident that you will successfully achieve your educational goals. To the Instructor Engineering courses for first-year students cover a wide range of topics from an overview of the engineering profession to discipline-specific subjects. broad set of course goals, including coverage of prerequisite material, motiva- tion, and retention, have spawned a variety of first-year activity. Courses in introductory engineering and problem solving routinely utilize spreadsheets and mathematical solvers in addition to teaching the rudiments of a computer language. The Internet has become a major instructional tool, providing a wealth of data to supplement your class notes and textbooks. This sixth edition continues the authors' intent to introduce the profession of engineering and to provide students with many of the tools and techniques needed to succeed. The sixth edition of this text draws on the experiences the authors have encountered with the first five editions and incorporates many excellent sug- gestions from faculty and students using the text. Over the past 30 years the fundamentals of problem solving have remained nearly the same, but the numerical tools and presentation techniques have improved tremendously. Therefore our general objectives remain the same for this sixth edition, and we have concentrated on new problems and improvements in the textual material. The objectives are (1) to motivate engineering students during their first year when exposure to the subject matter of engineering is limited, (2) to pro- vide students with experience in solving problems in both SI and customary units while presenting solutions in a logical manner, (3) to introduce students