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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
Why do the undersides of CDs have rainbow colours?
The rainbow-like colors on the undersides of CDs are caused by the interference of light waves as they pass through the thin layers of the CD's surface. The patterns are formed due to the way the layers are structured and reflect light. It's a result of the physics of light interacting with the surface of the CD.
How was vehicle tracking originally used in space?
Well it all started with the war...Nuclear Submarines would navigate underwater but when surfaced would get lost. Not much point of having a lost weapon so they launched Global Positioning Satelites hence GPS. Now there are about 14 satelites doing this. They give you can accurate position within 10 metres. They also used this technique to build the tallest longest sky bridge in france.
How does Newton's Second Law relate to rocket movement?
A rocket in its simplest form is a chamber enclosing a gas under pressure. A small opening at one end of the chamber allows the gas to escape, and in doing so provides a thrust that propels the rocket in the opposite direction. A good example of this is a balloon. Air inside a balloon is compressed by the balloon's rubber walls. The air pushes back so that the inward and outward pressing forces are balanced. When the nozzle is released, air escapes through it and the balloon is propelled in the opposite direction.
When we think of rockets, we rarely think of balloons. Instead, our attention is drawn to the giant vehicles that carry satellites into orbit and spacecraft to the Moon and planets. Nevertheless, there is a strong similarity between the two. The only significant difference is the way the pressurized gas is produced. With space rockets, the gas is produced by burning propellants that can be solid or liquid in form or a combination of the two.
One of the interesting facts about the historical development of rockets is that while rockets and rocket-powered devices have been in use for more than two thousand years, it has been only in the last three hundred years that rocket experimenters have had a scientific basis for understanding how they work.
The science of rocketry began with the publishing of a book in 1687 by the great English scientist Sir Isaac Newton. His book, entitled Philosophiae Naturalis Principia Mathematica, described physical principles in nature. Today, Newton's work is usually just called the Principia. In the Principia, Newton stated three important scientific principles that govern the motion of all objects, whether on Earth or in space. Knowing these principles, now called Newton's Laws of Motion, rocketeers have been able to construct the modern giant rockets of the 20th century such as the Saturn V and the Space Shuttle. Here now, in simple form, are Newton's Laws of Motion.
- Objects at rest will stay at rest and objects in motion will stay in motion in a straight line unless acted upon by an unbalanced force.
- Force is equal to mass times acceleration.
- For every action there is always an opposite and equal reaction.
Newton's Second Law
This law of motion is essentially a statement of a mathematical equation. The three parts of the equation are mass (m), acceleration (a), and force (f). Using letters to symbolize each part, the equation can be written as follows:
f = maBy using simple algebra, we can also write the equation two other ways: a = f/mm = f/aLet's apply this principle to a rocket. Replace the mass of the cannon ball with the mass of the gases being ejected out of the rocket engine. Replace the mass of the cannon with the mass of the rocket moving in the other direction. Force is the pressure created by the controlled explosion taking place inside the rocket's engines. That pressure accelerates the gas one way and the rocket the other.
Some interesting things happen with rockets that don't happen with the cannon and ball in this example. With the cannon and cannon ball, the thrust lasts for just a moment. The thrust for the rocket continues as long as its engines are firing. Furthermore, the mass of the rocket changes during flight. Its mass is the sum of all its parts. Rocket parts includes engines, propellant tanks, payload, control system, and propellants. By far, the largest part of the rocket's mass is its propellants. But that amount constantly changes as the engines fire. That means that the rocket's mass gets smaller during flight. In order for the left side of our equation to remain in balance with the right side, acceleration of the rocket has to increase as its mass decreases. That is why a rocket starts off moving slowly and goes faster and faster as it climbs into space.
Newton's second law of motion is especiaily useful when designing efficient rockets. To enable a rocket to climb into low Earth orbit, it is necessary to achieve a speed, in excess of 28,000 km per hour. A speed of over 40,250 km per hour, called escape velocity, enables a rocket to leave Earth and travel out into deep space. Attaining space flight speeds requires the rocket engine to achieve the greatest action force possible in the shortest time. In other words, the engine must burn a large mass of fuel and push the resulting gas out of the engine as rapidly as possible. Ways of doing this will be described in the nextchapter, practical rocketry..
Newton's second law of motion can be restated in the following way: the greater the mass of rocket fuel burned, and the faster the gas produced can escape the engine, the greater the thrust of the rocket.
Putting Newton's Laws of Motion TogetherAn unbalanced force must be exerted for a rocket to lift off from a launch pad or for a craft in space to change speed or direction (first law). The amount of thrust (force) produced by a rocket engine will be determined by the mass of rocket fuel that is burned and how fast the gas escapes the rocket (second law). The reaction, or motion, of the rocket is equal to and in the opposite direction of the action, or thrust, from the engine (third law).What is the difference between the spark and arc please?
A spark is formed when the electric field strength exceeds the dielectric field strength of air. Meaning that when an area of space's electronic strength exceeds the area surrounding it, a spark occurs to modulate or evenly distribute the electrical strength.
An Arc occurs when an highly conductive object with a high electrical charge is in the proximity of a highly conductive object with a low electrical charge, allowing the electrical field to travel through an area with lower conductive properties (such as air) to the object which is highly conductive but contains a lower charge than the other object. Rubbing your feet on a carpet and touching someone is a good example of this occurrence.
The difference in a spark and an arc is a spark is a singular occurrence which only needs a single particle to occur and in order to create or induce an Arc, two object are needed.
If your asking about Sky TV, then in the UK there are various packages available, some include TV, Broadband and Phone calls, if you sign up for two years then the instalation and equipment is usually free with a monthly fee of between £18 an £31 depending on the package you select.
What is the name of the Chinese inventor who made the compass?
The Chinese inventor who first created the compass is believed to be Shen Kuo, a polymath and statesman from the Song dynasty. However, the compass as we know it today was further developed and popularized by the Chinese explorer Zheng He during the Ming dynasty.
How will solar technology help astronauts?
Solar technology can provide a renewable and efficient source of power for spacecraft and space missions. By harnessing the energy from the sun, astronauts can generate electricity to power essential systems on board, such as life support, communication, and navigation systems. Solar panels also reduce the reliance on traditional fuel sources, making missions more sustainable and cost-effective.
Image mosaicing is the process of stitching together multiple images to create a larger, seamless panoramic image. This technique is commonly used in photography and satellite imaging to capture a wider field of view that would not be possible with a single shot. Mosaicing typically involves aligning, blending, and compositing individual images to create a continuous visual representation.
Robby the Robot in lost in space?
This is a flag of convenience. Robby the Robot was one of the (features) of the Forbidden Planet ( which was made entirely indoors- a triumph of trick photography) animal shots like the Tiger were superimposed. The Lost In Space robot was un-named. it did have the cipher B-9 ( obviously a pun on the word benign) It or he was only addressed as Robot. Robby the Robot was somewhat similar mechanically but more flussed- out.
The telegraph was invented in the 1700s, specifically in the late 1700s and early 1800s. It used electrical signals to transmit messages over long distances, allowing people miles apart to communicate almost instantly.
What are some of the benefits of satellites in everyday life?
Satellites provide services like GPS navigation, weather forecasting, communication, and monitoring of natural disasters. They also enable global internet access and support agriculture, transportation, and emergency response systems. Additionally, satellites play a crucial role in scientific research, such as studying climate change and tracking wildlife.
What did astronauts use in space that are used in everay life?
Astronauts use many common items in space that are also used in everyday life on Earth, such as toothbrushes, towels, and Velcro for securing objects in microgravity. They also use tools like screwdrivers and wrenches to perform maintenance on the spacecraft and equipment. Additionally, astronauts consume food and beverages that are similar to what we have on Earth, although they are specially packaged for space travel.
What are advantages of going into space?
GPS, cellular telephones, television, internet... All of these technologies use satellites. There are myriad other everyday items we use that were developed for space travel and found their place in homes and businesses.
A resolver is a type of sensor that converts mechanical motion into an electrical signal. It is commonly used in industrial applications to provide feedback on the position or speed of rotating machinery. Resolvers are known for their robustness and reliability in harsh environments.
How do you make your Giratina go into Origin form?
when you have completed the sinoh Dex go to turn back cave located next to sendoff spring and find your way through it. when you get to the portal go through it and find the gresious orb then give it to giratina and he will change form.
Does the ride thirteen go upside down?
No, the ride Thirteen at Alton Towers in the UK does not go upside down. It is a vertical drop roller coaster that features a backward section and various surprises, but it does not have any inversions.
Names of Indian scientists working at NASA?
Some Indian scientists who have worked at NASA include Kalpana Chawla, Sunita Williams, and Swati Mohan. Kalpana Chawla was the first woman of Indian origin in space, Sunita Williams has spent time on the International Space Station, and Swati Mohan played a key role in the recent Mars Perseverance rover mission.
Why do scientists send robots to space?
The problem with human exploration of space is that you have to spend a lot of money creating an environment that supports human life. A robot doesn't need (much) heat, light or oxygen and no one cries if it dies or can't get back. So it's much cheaper to send a robot.
Robots can also be sent to places where a human would struggle to perform useful experiments - so they can be used to investigate close to volcanoes or undersea and take samples without being hampered by gloves.
Where is the eye hook on a dragster?
The eye hook on a dragster is typically located on the front bumper or chassis, where it is easily accessible for towing or recovery purposes. It is an important safety feature to ensure that the vehicle can be moved quickly and safely in case of emergencies on the track.
Can germs be seen with a uv light?
No, germs cannot be seen with a UV light. UV light can be used to disinfect surfaces by killing germs, but it does not make germs visible to the human eye. Germs are microscopic organisms that are not visible without the use of a microscope.
Which type of satellite in space stays above one certain area all of the time?
We call such satellites "geosynchronous". That means the time it takes them to make one revolution around the Earth is the same as the time it takes the Earth to revolve once. Yes, that's one day, 24 hours.
What is the temperature on Chi Cygni?
Chi Cygni is a variable star, meaning its brightness varies cyclically. Chi Cygni's temperature is typically given as 3000 K.
The Satrack system works by using satellites to track the position of objects or vehicles equipped with a GPS transceiver. Satellites in the Global Navigation Satellite System (GNSS) network communicate with the GPS transceiver to determine the object's location in real-time. This information is then relayed back to a central monitoring station for tracking and monitoring purposes.
How in the future will you be able download and store your memories?
In the future, downloading and storing memories is a concept mostly found in science fiction. Currently, there is no technology that allows for this capability. It remains more of a theoretical idea than a practical reality.
