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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
What is the difference between the cylindricity and total runout in gd and t?
It is a common misconception that roundness and cylindricity can be checked by taking diametral measurements (as with a micrometer) or by using an indicator and vee block. A diametral measurement does just what the words imply; it measures the diameter. It does not check the shape of the surface which is what roundness and cylindricity control.
Total runout involves moving the dial indicator along the length of the part while the part is rotated, so that it controls the cumulative variations of circularity, cylindricity, straightness, coaxiality, angularity, taper, and profile.
What are earthquakes measured?
Earthquakes are measured using the Richter Scale, Moment Magnitude Scale, or the Modified Mercalli Intensity Scale. These scales take into account characteristics of the seismic waves and the effects of the earthquake on structures and the environment to determine its magnitude and intensity.
What tools are needed to take apart a trampoline?
To take apart a trampoline, you will likely need tools such as a wrench or pliers to remove bolts, a screwdriver to disassemble components, and possibly a pair of scissors or a knife to cut through any zip ties or netting. It is also helpful to have a hammer or rubber mallet to help disassemble stubborn parts.
Why is plastic a good material to use for ear defenders?
Plastic (in conjunction with a couple of other materials) is a good choice for ear defenders for a number of reasons. First, it's tough and effective. It's also fairly cheap, readily available and easy to work with. Plastics come in a wide variety of types and with as wide a range of characteristics. Can anyone lookaround himself in a day and not see something made of plastic that is in use? Plastic is an excellent material from which to make ear defenders.
The string which is tied tightly will vibrate faster than a loose one.
Reason:-
Consider a string tied strongly from its ends. Since it is tied tightly, on application of a force perpendicular to its length, a strong repulsive force along its length will come into play. More repulsive force means more faster tendency of the string to return to its normal state. Hence it will vibrate faster.
What is the name of the weights that are used to balance tires?
The weights used to balance tires are called wheel weights. They are attached to the rim of the wheel to ensure that the tire rotates smoothly without causing vibrations.
Can you name the 39 types of metal?
{| ! style="background: rgb(204, 204, 255) none repeat scroll 0% 0%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial" colspan="2" | Alkali metals |} Lithium, Sodium, PotassiumRubidium, Caesium, Francium {| ! style="background: rgb(204, 204, 255) none repeat scroll 0% 0%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial" colspan="2" | Alkaline earth metals |} Beryllium, Magnesium, CalciumStrontium, Barium, Radium {| ! style="background: rgb(204, 204, 255) none repeat scroll 0% 0%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial" colspan="2" | Transition metals |} Zinc, Molybdenum, CadmiumScandium, Titanium, VanadiumChromium, Manganese, IronCobalt, Nickel, CopperYttrium, Zirconium, NiobiumTechnetium, Ruthenium, RhodiumPalladium, Silver, HafniumTantalum, Tungsten, RheniumOsmium, Iridium, PlatinumGold, Mercury, Rutherfordium,Dubnium, Seaborgium, Bohrium,Hassium, Meitnerium,Darmstadtium, Roentgenium, Ununbium {| ! style="background: rgb(204, 204, 255) none repeat scroll 0% 0%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial" colspan="2" | Post-transition metals |} Aluminium, Gallium, IndiumTin, Thallium, Lead, BismuthUnuntrium, UnunquadiumUnunpentium, Ununhexium {| ! style="background: rgb(204, 204, 255) none repeat scroll 0% 0%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial" colspan="2" | Lanthanoids |} Lanthanum, Cerium, PraseodymiumNeodymium, Promethium, SamariumEuropium, Gadolinium, TerbiumDysprosium, Holmium, ErbiumThulium, Ytterbium, Lutetium {| ! style="background: rgb(204, 204, 255) none repeat scroll 0% 0%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial" colspan="2" | Actinoids |} Actinium, Thorium, ProtactiniumUranium, Neptunium, PlutoniumAmericium, Curium, BerkeliumCalifornium, Einsteinium, FermiumMendelevium, Nobelium, Lawrencium
What is the value of the thickness of wire using He-Ne laser?
The value of the thickness of wire using a He-Ne laser can be determined by measuring the interference pattern produced when the laser light is reflected off the wire. By analyzing this interference pattern, the thickness of the wire can be calculated based on the wavelength of the laser light and the angles at which the interference occurs.
How would you measure a refrigerator?
You can measure a refrigerator by using a tape measure to determine the height, width, and depth of the exterior dimensions. Make sure to measure from the widest points, including any handles or protruding parts.
A sweep net is a tool used in entomology to collect insects. It consists of a net attached to a metal frame and handle. By sweeping the net through vegetation, insects are caught in the netting for observation and study.
What is the most abundant alternative energy source?
Solar energy is the most abundant alternative energy source, as the sun provides more energy in one hour than the entire world consumes in a year. Solar panels can harness this energy and convert it into electricity for various applications.
Polyester oil is a type of synthetic oil that contains ester compounds. It is often used in high-performance and racing engines due to its ability to withstand high temperatures and provide better lubrication than traditional oils. Polyester oils are known for their resistance to oxidation and thermal breakdown.
What causes an error in reading a voltmeter?
Errors in reading a voltmeter can be caused by factors such as poor connection of the voltmeter probes to the circuit, incorrect range selection on the voltmeter, and external electromagnetic interference affecting the measurement. Additionally, using a voltmeter with low battery or a faulty internal circuit can also lead to erroneous readings.
What is difference between blank space and white space?
"Blank space" usually refers to an area within a document or design where there is nothing present. "Whitespace" or "white space" is a design term that refers to the intentional use of space in a layout, often used to enhance readability or create visual balance. Blank space can be any color, while whitespace specifically refers to empty space in a design that is usually left white.
Are 200MW laser pointers illegal in the UK?
Yes they are ! Anything over 5mW is classed as a WEAPON ! Even the low-power ones could land you in trouble if you were to shine it in someone's eyes. ANY concentrated beam of light directed into the eyeball can cause temporary or PERMANENT blindness !
Yes, hot iron emits infrared radiation as it is heated. This is because all objects with a temperature above absolute zero emit infrared radiation as part of the electromagnetic spectrum.
What is the minimum and maximum of Fahrenheit scales?
The minimum value on the Fahrenheit scale is -459.67°F, known as absolute zero, which represents the complete absence of thermal energy. The maximum value is theoretically infinite, as the scale extends infinitely in the positive direction.
motion sensors see by sending out waves and timing how long it takes them to get back, when this time changes ( like someone stepping into a room) the motion sensor can tell that motion has been detected
What happen when you increase picks in fabric?
When you increase picks in fabric, the fabric becomes denser and stronger due to more yarns being interlaced in the fabric structure. This can also lead to better coverage and improved resistance to wear and tear. However, increasing picks can also result in a heavier and stiffer fabric with reduced drape and flexibility.
Did the telephone save time or money?
Because of the telephone first nations people so on, so on, they didn't have to travel ALL the way across the country. But saving money there could be a posiblilty of they governent or president that get's money from the phone bill. -Mouseadoodle
What is the purpose of polymers?
Polymers serve a variety of purposes, including being used as materials for manufacturing plastics, fibers, rubber, and adhesives. They are also essential in industries like healthcare, construction, and electronics for applications such as drug delivery, insulation, and circuitry. Additionally, polymers can be designed with specific properties to meet diverse needs, making them versatile and valuable materials.
Meaning:
A photometer for comparing two light radiations wavelength by wavelength
Classified under:
Nouns denoting man-made objects
Hypernyms ("spectrophotometer" is a kind of...):
photometer (measuring instrument for measuring the luminous intensity of a source by comparing it (visually or photoelectrically) with a standard source)
Meaning:
A photometer for comparing two light radiations wavelength by wavelength
Classified under:
Nouns denoting man-made objects
Hypernyms ("spectrophotometer" is a kind of...):
photometer (measuring instrument for measuring the luminous intensity of a source by comparing it (visually or photoelectrically) with a standard source)
What factors determine the maximum altitude of an airplane?
Short Answer:
An airplane maintains altitude by producing enough lift to counteract its own weight. So the amount of lift an airplane produces determines how high it can climb. Lift is produced by accelerating air in a downward direction. At higher altitudes the air is less dense so a larger volume must be accelerated downward to produce enough lift to keep flying. This can be done in two main ways; flying faster or having longer wings. The faster you fly the more air you pass through so the more you can accelerate downward which generates more lift. The longer your wings are the more surface area you have to generate lift so you can maintain altitude. You can also make your plane lighter while maintaining its top speed and wing length by carrying less fuel and cargo or using smaller pilots. Given the same speed and wing length a lighter plane can maintain altitude in less dense air so it can climb higher than a heavier plane that is traveling the same speed.
Longer Answer:
Lift can also be generated by an airplanes engine if that engine is pointed towards the ground. In fact some airplanes can fly straight up by generating all their lift with their engine and none with their wings. So with a powerful enough engine there is not limit to how high an airplane can fly. However most airplanes use "air breathing" engines that burn fuel with oxygen supplied by the atmosphere. The higher you go the less air there is in a given volume of sky so the less oxygen is gets sucked into the engine to burn fuel. Pilots have reduce the fuel flow to their engines as they go higher since the extra fuel would be wasted with no oxygen to burn it and it would tend foul the engine with partially burned residue making it run less efficiently or stalling it out completely. With less fuel to the engines the airplane slows down until it produces exactly enough lift to maintain its altitude. It's possible to get a little higher by diving and speeding up then pulling up hard and letting the airplanes momentum carry it to a higher altitude temporarily but when it slows down it will drop back to an altitude where lift equals the planes weight at the highest speed possible given the amount of oxygen in the air at that altitude. If a plane could get going over 25,000 mph (33 times the speed of sound) and and coast out of the atmosphere before it slowed down much below that speed it would keep going since it would be above escape velocity needed to get out of the earth's gravitational field. If it were pointed in the right direction and kept going faster than about 17,000 mph it could go into orbit in space.
Rocket engines carry their own oxidizer which contains the oxygen to burn the fuel so they can run even in the vacuum of space above around 100 km (330,000 feet). The only limitation on altitude for them is how much fuel they can carry before they are too heavy to lift themselves.
So the real answer to the question is that the main factor determining maximum altitude for an airplane is how high the engine can go before the air gets too thin to maintain enough velocity to balance the plane's weight against lift. Longer wings and less drag (a more aerodynamic shape) will help the same engine fly higher as will a lighter plane.
An airplane with a rocket engine that does not breath air is limited by how much fuel it can lift when starting off. Too much fuel weight and the plane won't take off until the excess weight of fuel has been burned. Once the rocket plane lifts off the altitude limit is determined by how fast the plane can get going before running out of fuel. If it can accelerate to 25,000 mph or faster it can go forever. If it can go at least 17,000 mph it can go into orbit in space more than 330,000 feet up (62 miles). Otherwise you can use rocket science equations to figure out how high it can get before it starts falling using the vehicle mass, rocket engine thrust, fuel burn rate and atmospheric drag. This is a complex calculation because the mass, and atmospheric drag change as a function of altitude and the fuel burn rate and engine thrust usually don't stay the same throughout the flight.
Do running water derive energy from sun?
Running water does not receive energy directly from the sun. The energy in running water comes from the water cycle, where the sun's energy evaporates water from oceans and lakes, which then falls as precipitation and flows downhill due to gravity, creating streams and rivers that can be used for hydroelectric power generation.
Can you walk faster than normal in Clubpenguin?
No, players cannot walk faster than the normal speed in Club Penguin. The game has a fixed speed for all characters to maintain fair gameplay.
