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  Materials Neodymium magnets, also called rare earth magnets, 12 mm x 3 mm each (6 pack). Note: You can also use a single larger neodymium magnet instead of a stack of smaller magnets. Regular "refrigerator" magnets (or "ceramic") magnets will not be strong enough for this project. Magnet wire (one spool of 30 gauge wire) Alligator clip leads (2 pack) 3.5 mm stereo cable (male plug on one end, three exposed wires on the other...

Kinetic or Magic sand is actually just regular sand, with one important ingredient added – silicone oil. Silicone is a term used to refer to a group of materials that contain the elements silicon and oxygen. Silicones are polymers, or molecules made up of long chains of repeated units. Silicones are used in everything from hand lotion to car engine oil – they’re all around us! The reason we use silicones...

Introduction An infinity mirror creates an optical illusion of an infinitely long tunnel. It actually consists of two mirrors — a regular mirror and a one-way mirror — with light emitting diodes (LEDs) sandwiched between them. When the LEDs are turned off, the infinity mirror acts just like a regular mirror. But when the LEDs are turned on, the infinity mirror looks like a brightly lit tunnel that stretches off to infinity. This engineering design project will show...

Motors that use direct current (DC) voltage are found in many familiar items, such as electric shavers, battery-powered drills, and the fans in laptop computers. DC voltage does not alternate with time. For example, a 9-volt (V) battery has a constant voltage difference between its positive and negative terminals of 9 V. A graph of the voltage at the positive terminal vs. time would be a straight line at 9 V. Alternating current, on the other...

A radio is an electrical device that receives an invisible signal, or radio wave, from a radio station and converts the signal into sound that we hear and understand. A radio wave is a type of electromagnetic radiation that can be used to convey audio information. Radio waves have energy associated with them. Using a transmitter and an antenna, radio stations transmit waves like the ones in Figure 1, which shows both a...