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There are numerous applications of physics to engineering and other technical fields: to name but a few: 

(a) Civil engineering involves designing and building bridges, dams, sky-scrapers, roads, and railways, using our physics knowledge of forces, fluid pressure, and gravity. 

(b) Electrical engineering involves designing electrical circuits including motors, electronic appliances, optical fiber networks, computers, and communication links. Circuits use physics principles like voltage, current and resistance. 

(c) Chemical engineering involves designing systems for oil refining, the creation of industrial chemicals and man-made fibers and products, which requires an understanding of molecular forces. 

(d) Mechanical engineering deals with aircraft, engines, weapons, cars, pneumatics, and hydraulics. For these we have to understand forces, and complex fluid motions like air flow across an aircraft, or water flow through tubes.

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