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PREFACE:
"Mechanics of Solids" is a crucial course for all engineering students, as it helps them develop analytical skills. In this course, the laws of mechanics are applied to various parts of bodies, enabling students to solve engineering problems while maintaining the continuity of these parts.
The author has clearly explained the involved theories and illustrated them by solving numerous engineering problems. Neat diagrams are provided, and solutions are given without omitting any steps. SI units and standard notations, as recommended by the Indian Standard Code, are consistently used throughout the book. The author has tailored this book to match the latest syllabus of Gujarat Technical University.
The author hopes that students and teachers of Gujarat Technical University will receive this book warmly, as previous books by the author have been well-received by students and teachers across India.
Suggestions and corrections are welcome. The author acknowledges the efforts of M/s. New Age International Publishers in producing this book in a commendable form. He also expresses gratitude for the opportunity provided by AICTE to be associated with B.U.B. Engineering College, Hubli.
The following terms are fundamental to the study of mechanics and should be clearly understood:
Mass: The quantity of matter possessed by a body. The mass of a body remains unchanged unless the body is damaged and a part of it is physically separated. Even if the body is taken into space, its mass remains constant, although its weight may change due to variations in gravitational force. The body may become weightless when gravitational force is absent, but its mass remains the same.
Time: Time measures the succession of events. The rotation of the earth about its axis is used to define a day. For convenience, a day is divided into 24 hours, an hour into 60 minutes, and a minute into 60 seconds. Clocks are used to measure time. To address irregularities in the earth's rotation, the second is defined as the duration of 9,192,631,770 periods of radiation of the cesium-133 atom.
Space: The geometric region in which the study of a body is involved. A point in space can be referred to with respect to a predetermined point using a set of linear and angular measurements. The reference point is called the origin, and the set of measurements are known as coordinates. Cartesian coordinates are used for mutually perpendicular directions, while the Polar Coordinate System involves angles and distances.
Length: A measure of linear distance. Examples include the diameter of a cylinder (300 mm), the height of a building (15 m), and the distance between two cities (400 km). The metre is the standard unit of length, defined initially by the length of a platinum-iridium bar kept at the International Bureau of Weights and Measures. Currently, a metre is defined as 1,650,763.73 wavelengths of krypton-86 radiation.
Continuum: A body is considered as a continuous distribution of matter, despite being composed of particles that can be subdivided into molecules, atoms, and electrons. For practical purposes in solving engineering problems, the body is treated as a continuum rather than a collection of discrete particles.