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Technology
The practical application of knowledge, especially in a particular area, is called technology. Advances in technology affect every area of our lives. This category is for questions about technology and includes everything from how to remove a scratch from a CD to applications of electronics to what polyester is made from and more.
35,090 Questions
How much energy does ulraviolet have?
Ultraviolet (UV) light has higher energy than visible light but lower energy than X-rays. It ranges from about 3 electron volts (eV) to 124 eV, with shorter wavelengths corresponding to higher energies. UV light is important for processes like photosynthesis and can cause skin damage if exposure is prolonged.
Cinefluoroscopy is a diagnostic test that essentially makes a 'motion picture' of a normal barium swallow. This allows providers to see if there is a problem with motility in one's gastrointestinal tract (i.e. esophagus)
When a parachute falls what is compressed?
When a parachute opens and falls, air beneath it is compressed in the canopy. The compressed air holds the chute open, and the open chute presents a large cross sectional area to the air in the direction it is moving (which is down). The large cross section of the open chute means that as it moves through the air, the whole area of the open chute will present a "front" to the air, and it will make it difficult for the air to move out and up past the chute (or make it difficult for the chute to move down through the air, whichever you prefer). The net result is that the chute and its load (a person, a cargo pack, or whatever) won't be able to move nearly as quickly through the air as the load alone without the chute for drag.
If you wish to think through the problem and investigate further, you'll discover that the pressure in the chute is highest at the top in the middle. If a jumper opens his chute and a panel or two is blown out in some kind of failure, the jumper will have to make a decision about whether to cut away and open a reserve, open a reserve without cutting the primary chute away (and risking a tangle), or just riding the primary chute in with the blown panels. If the panels that have failed are in the sides of the chute, the incident is not as serious as if the panels that blew out are in the top. As the top is the higher pressure area of the chute, a blown panel is much more serious there as air at higher pressure is escaping through the chute (rather than out from under it and around it), and this will provide less "slowing" for the load on the chute. Again, think it through and consider what air is doing as the chute moves down through it and you'll be able to puzzle it out.
How are solar cells of today superior to solar cells of the 1980s?
Solar cells of today are typically more efficient, producing more electricity from the same amount of sunlight. They are also more cost-effective due to advancements in manufacturing processes and materials. Additionally, modern solar cells are more durable and have a longer lifespan than those from the 1980s.
What is the phase of emulsions?
Emulsions consist of two immiscible liquids, with one dispersed in the other as small droplets. They can exist in various phases, such as oil-in-water, water-in-oil, or multiple emulsions with more complex structures. The phase of an emulsion depends on the relative proportions of the two liquids and how they interact with each other.
Fear from fraud saw what overtake the toaster as top selling domestic appliance in 2005?
Fear from fraud saw the air fryer overtake the toaster as the top-selling domestic appliance in 2005.
Radar is important because it allows for the detection of objects beyond the range of human vision, such as aircraft and severe weather systems. It plays a critical role in aviation, weather forecasting, defense, and maritime navigation by providing valuable information about the location, speed, and size of objects.
What year were crystals found?
Crystals have been found throughout history, with the earliest known use dating back to around 4000 BCE in ancient Mesopotamia. However, the specific year when crystals were first discovered is not known.
What is an example of a metal alloy?
An example of a metal alloy is stainless steel, which is made by combining iron with chromium, nickel, and other elements. This alloy is known for its resistance to corrosion and high strength, making it popular in various applications from kitchen utensils to structural components in buildings.
What are the two limitations of solar energy?
Solar energy is only useful when the sun is shining. During the night, your expensive solar equipment will be useless and solar energy installation requires a large area for the system to be efficient in providing a source of electricity.
What does the word unphotogenic mean?
"Unphotogenic" refers to someone or something that does not photograph well or does not look good in photos compared to real life. This term is used to describe individuals who may not appear as attractive in pictures as they do in person.
How does the density of water change when it moves from a liquid to a gas?
First of all, the density of water decreases when it gets in gas state. Density is depended on mass and volume and thus the formula density= mass/volume. When water gets into gas state, the volume increases which results in an decrease in density.
Is convection a heat transfer?
Yes, convection is a heat transfer mechanism where heat is transferred through the movement of fluid (liquid or gas). This movement can be either natural convection (due to density differences) or forced convection (due to external forces like fans or pumps).
thermoplastics and thermosetting plastics
thermoplastics go soft when exposed to heat
thermosetting plastics set (harden) when exposed to heat
only thermoplastics are recyclable
Why do you measure electricity?
Electricity is measured to ensure accurate billing for usage, track energy consumption for resource planning, and monitor and troubleshoot electrical systems for optimal performance and safety. Measurements help to manage energy efficiently and ensure that electrical systems are operating within their design parameters.
Who was the inventor of the trampoline?
The modern trampoline was invented by George Nissen and Larry Griswold in 1936. They were inspired by watching trapeze artists perform tricks into a safety net and wanted to create a safer way to practice similar stunts.
Does Crayola dustless chalk leave an oil residue which is hard to remove?
Yes, the dustless chalk does leave an oily residue which is hard to remove. The reason for this is because in order to rid the chalks of dust producing qualities, moisture needs to be kept in the chalks. I recommend Mr Magic Eraser or a regular cleaner is fine. It needs to be something soapy to break through the grease.
Where do you get a super conductor?
Equipment
To make an yttrium-barium-copper-oxide superconductor, you will need:
* Yttrium Oxide
* Barium Carbonate (TOXIC)
* Cupric Oxide
* A Laboratory Furnace or a converted pottery kiln.
* Labware made of alumina.
* An Oxygen Source
* Liquid Nitrogen and a rare-earth magnet for testing and demonstrating the superconductors.
Method
There are a number of methods of producing ceramic superconductors like this, but the simplest is the so-called "shake and bake" method, which involves a four step process:
1. Mixing the chemicals;
2. Calcination(the initial firing);
3. The intermediate firing(s) (oxygen annealings);
4. The final oxygen annealing.
What is the difference between compressor and condensor?
Compressors are similar to pumps: both increase the pressure on a fluid and both can transport the fluid through a pipe. As gases are compressible, the compressor also reduces the volume of a gas. Liquids are relatively incompressible, so the main action of a pump is to pressurize and transport liquids.
In systems involving heat transfer, a condenser is a device or unit used to condense a substance from its gaseous to its liquid state, typically by cooling it. In so doing, the latent heat is given up by the substance, and will transfer to the condenser coolant. Condensers are typically heat exchangers which have various designs and come in many sizes ranging from rather small (hand-held) to very large industrial-scale units used in plant processes. For example, a refrigerator uses a condenser to get rid of heat extracted from the interior of the unit to the outside air. Condensers are used in air conditioning, industrial chemical processes such as distillation, steam power plants and other heat-exchange systems. Use of cooling water or surrounding air as the coolant is common in many condensers.
Is silk good to wear in hot weather?
Yes, silk is a breathable and lightweight fabric that can help keep you cool in hot weather by allowing your skin to breathe. It also has moisture-wicking properties, making it a good choice for staying comfortable in warm temperatures.
What is meant by quantization of energy?
The term quantum is taken from Latin and simply means amount or quantity. In the field of quantum mechanics it has been determined that there is a specific amount of matter, energy, space, or time, which is the smallest possible amount. In other words, energy comes only in certain packages. It cannot be subdivided without limit, into ever smaller amounts. This is not unlike the fact that there is a smallest amount of any given chemical element. The smallest amount of oxygen you can have is one oxygen atom. You can cut it in half, but if you do, it isn't oxygen anymore. However, you can't cut one quantum of energy in half. One quantum of energy is the smallest amount of energy that you can have. No smaller amount is possible. Physicists will express this idea by saying that energy is quantized.
How do you fade out polyester?
To fade polyester fabric, you can try soaking it in a mixture of hot water and bleach for a short period of time. Rinse it thoroughly after soaking and repeat the process if needed. Keep in mind that excessive exposure to bleach can weaken the fabric, so it's crucial to monitor the process carefully.
Do microwaves use infrared technology?
No, microwaves use electromagnetic radiation in the microwave range (around 2.45 GHz) to heat food. Infrared technology is different, using electromagnetic radiation in the infrared spectrum to transfer heat.
The portion of apparent power that doesn t do any work is termed as?
Reactive power is the portion of apparent power that does not do any useful work, but instead oscillates between the source and load causing voltage and current to be out of phase.
