One of the basic questions regarding the earth is, how fast does it spin? The earth is constantly spinning; it spins around its axis. An axis in this case is an imaginary line running through the center of the earth from the North Pole to the South Pole. To calculate how fast the earth spins, …
Magnetic propulsion is the act of moving an object with magnetic fields and a flowing electrical current. The current is used to manipulate the system’s magnetic field or charge a fluid in the system that can be repelled. The Lorentz force then pushes the conductor in a direction that is perpendicular to the magnetic field …
Fraxel laser is a technology that is used for dealing with age spots, melasma (Mask of Pregnancy), sunspots, wrinkles at various parts of the face, upper lip lines, sun burned skin, and acne scars. Today it is the prime technology used for treating acne scars, as it barely creates any downtime. Initially developed and implemented …
Backscatter X-ray machines were built specifically for airport security. Backscatter X-ray technology can strip off a person’s clothing in the captured image to show him or her practically naked. In the process, it will show any contraband such as ceramic knives, liquid explosives or drugs that the person was carrying but were previously undetectable by …
Total Harmonic Distortion (THD) is a measured difference in audio levels between the input audio signal’s harmonics and the harmonics of the output audio signal of an amplifier or other audio device. Output Distortion Level As the signal passes through an amplifier it is always somewhat distorted at its output. The waveform at the input …
A Segway is a vertical, mobile vehicle that is able to carry a single person between distances. While a bicycle consists of two wheels and a horizontal frame, a Segway consists of two or four wheels and a vertical frame that balances atop these wheels to steady the rider. Segways run on purely electrical energy …
Waste oil is the term used to refer to any petroleum-based/synthetic oil that is no longer considered usable. This may be due to the presence of excessive impurities, loss of the oil’s original properties, or just from the oil being over-exposed to the elements. A classic problem for society has been how to dispose of …
Before 1982, the penny was made of copper which is why they, unlike most other coins, don't look silver. However, after 1982, the U.S. government realized that it was too expensive to make a penny–more than the penny was worth in money–so they decided, instead, to make it with a mixture of two different metals. …
An oxygen generator is a device that produces oxygen on demand, usually through the use of inorganic reactions. There are several types of oxygen generators but each depends on thermal reactions to produce oxygen. This causes the generator to become very hot, between 500 and 1,200 degrees Fahrenheit, and can present a serious fire hazard …
Molality is the number of moles in a solute per kilogram of solvent. It is often confused with the term molarity, which is an alternative unit for concentration that measures the number of moles of solute per liter of solution. Molality is commonly used when experiments require significant temperature changes. This is because a solute’s …