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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
Can a plane stop in the mid air?
A plane can not completely stop in the air unless it is a special type of plane. Normal passenger or commercial planes as well as military planes can not stop completely in mid air though some helicopters can stop in mid air.
What do magnetically soft substances do?
Magnetically soft substances are easily magnetized and demagnetized. They have low coercivity, meaning they can quickly change their magnetic orientation when exposed to a magnetic field. These materials are often used in applications where the magnetic state needs to be easily manipulated, such as in transformers or magnetic shielding.
Does electricity pass through wood explain why?
Yes, electricity can pass through wood but at a slower rate compared to conductive materials like metal. This is because wood is a natural insulator with a high resistance to electrical flow. The moisture content and type of wood also play a role in determining how well it conducts electricity.
Polyester is a synthetic material that is inherently flame resistant, meaning it is less likely to catch fire compared to natural fibers like cotton or wool. However, if exposed to a high enough temperature, polyester can melt and burn. Treating polyester with flame retardant chemicals can further enhance its resistance to flames.
What type of glove is best used when the risk of an item slipping out of your hand is significant?
A glove with a textured or rubberized grip surface would be best in this situation to help provide better grip and reduce the risk of items slipping out of your hand. It is important to ensure that the glove fits properly to maintain dexterity and control while working.
What is a police radar detector?
A police radar detector is a device used by drivers to detect when law enforcement officers are using radar guns to measure vehicle speed. When a radar gun is detected, the device alerts the driver so they can adjust their speed accordingly to avoid getting a speeding ticket. However, it is important to note that using radar detectors is illegal in some jurisdictions.
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.
