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Delve into the history of the most potent artillery weapons in the era before gunpowder: catapults. Examine the workings of the ballista, onager, and trebuchet. Then get started on a model ballista capable of hurling a golf ball 200 feet. Analyze the machine's nylon torsion springs to ensure that they can store enough elastic energy to achieve the required 200-foot range.
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Professor Ressler shows how structural catastrophes produced two bridges that provide a wonderful opportunity to see and understand structure: Scotland's Firth of Forth Bridge and Canada's second Quebec Bridge. You'll also gain insights into the human element of engineering, and the reasons structures turn out the way they do.
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What happens to the 150 gallons of water that the average person uses and then sends down the drain each day? Delve into wastewater disposal and treatment. Among the details you investigate are the S-shaped trap in a waste pipe and that most ingenious of plumbing fixtures: the toilet.
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Plunge into hydraulics, learning how force is transmitted from actuators to hydraulic cylinders through fluid-filled lines. Then use this knowledge to design and build a hydraulically powered mechanical arm that can grasp and manipulate a concrete block - controlled by four hand-operated syringes. Along the way, use 3D printing to fabricate several crucial parts.
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One of the most potent human aspirations supported by engineering is to build up. Learn how this has been done from antiquity to the present with columns - structural members that carry load primarily in compression. You'll also learn about buckling: the often catastrophic stability failure that occurs in columns with certain geometric characteristics.
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After learning the science behind suspension bridges, begin your two-lecture look at these structural marvels. Here, relive the "Battle of the Cable," in which 19th-century engineers struggled over whether to build suspension cables from iron chains (as in England's Menai Strait Bridge) or steel wire (as in the Brooklyn Bridge).
7) Everyday Engineering: Understanding the Marvels of Daily Life: Your House as an Engineered System
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In the first of four lectures on your house as a technological system, review the eight engineered subsystems that go into modern dwellings. Then discover the miracle of building codes, which ensure that every new house is safe, constructible, and reasonably economical without involving an engineer in each design.
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Find that everyday highway overpass bridges are more interesting than they appear. These ubiquitous structures deserve to be admired for their simplicity and practicality. Plunge into the principles of multi-girder spans, and learn that new construction techniques make highway bridges more efficient and elegant than ever.
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How much energy can you save with a properly designed house? Would you believe all of it? Trace the trend in passive solar and net-zero-energy homes that are engineered to stay comfortable year-round by exploiting sunlight in winter and shielding against it in summer, with minimal operating costs.
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Learn why the arch is the principal structural feature of ancient Rome. Your detailed case studies range from simple bridges such as the Pont St. Martin and triumphal arches such as the Arch of Titus to massive aqueducts like the Pont du Gard and majestic public spaces like the Baths of Caracalla.
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Ride the rails to learn why rail transportation continues to thrive, two centuries after the modern railroad was introduced. Trace the origin of the standard rail gauge used in the U.S., probe the forces a locomotive must overcome to get rolling and then stop, and chart the rise of a revolutionary way of handling cargo: the intermodal container.
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Using the faucet as an example, study the bewildering number of ways that hot and cold water can be delivered into a sink, reflecting the challenges of designing everyday things. Along the way, consider the principles that go into a successful design: affordances, signifiers, mapping, constraints, and feedback.
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Get a taste of electrical engineering by designing and building an electric launch controller that will ignite your rocket engine safely. Design a circuit that meets all code requirements. Use Ohm's law to determine the number of batteries and type of resistor required. Also, get a lesson in proper soldering technique for assembling the circuit.
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Follow the seven steps in the engineering design process to create a golf ball launcher that can hit a target ten feet away. Apply the principle of conservation of energy to select the right steel spring for the job. After building and testing the launcher, consider the joys of do-it-yourself projects and the insights they provide about fundamental engineering concepts.
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Explore how two types of external forces - loads (forces applied to structures) and reactions (forces developed at supports, in response to applied loads) - act on structures such as Kansas City's Chouteau Bridge. Also, learn how these forces are related to the most important concept in engineering mechanics: equilibrium.
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What happens when you encounter a noteworthy structure that hasn't been included in this course and you want to know more about it? Professor Ressler devotes his final lecture to answering this question; sending you out into the world with suggested strategies for understanding any structure - great or otherwise.
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Nothing embodies everyday engineering like simple machines-the basic mechanical devices used for thousands of years that we rely on more than we may realize. Probe the wonders of the inclined plane, screw, wedge, lever, wheel-and-axle, and pulley, and ponder their myriad applications.
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Now that you understand the forces your cardboard tower must withstand, conduct a series of compressive and tensile strength experiments to determine the size and shape of your structure's beams, columns, and braces. After completing your design, build the tower using ordinary wood glue and simple tools. Then pile on concrete blocks and marvel at the strength of your creation.
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Why is cell phone service sometimes so unpredictable? Get inside the cellular network to learn how clever engineering makes a surprisingly large number of two-way conversations possible over a very narrow broadcast spectrum. Also see how the system leads to dead spots, dropped calls, and other familiar cell phone hassles.
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Coal, oil, and natural gas power the vast majority of electrical generating plants in use today. Learn how fossil fuels are extracted from the earth and how new technologies such as longwall mining and fracking have revolutionized the industry. Also examine some of the environmental drawbacks of these endeavors.
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