A Roman-built bridge in Italy, still going strong
Several of the solutions to this crossword relate to bridges and the materials used to build them. The notes explain how the design of a bridge must relate to the forces acting on it, and go on to discuss how the physical properties of materials such as cement and rocks affect the way they respond to applied forces
In your physics and maths education, when physical reasoning and maths are applied to any system the first thing to do is to simplify that system.
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