explain me about magnetic levitated train. it's important?
401445
please go thru the following pages\n\nhttp://science.howstuffworks.com/maglev-train.htm\nhttp://science.howstuffworks.com/maglev-train1.htm\nhttp://science.howstuffworks.com/maglev-train2.htm\nhttp://science.howstuffworks.com/maglev-train3.htm
172133
The most important device is the dynamo\nIt was invented by Michael Faraday, hardly 2 centuries ago\nThe 'watermill' was invented already more than a millenium ago.
881854
gravity and any type of electromagnetic radiation r two DIFFERENT things.if a region has a gravitational field then it can have a electromagnetic field at the same time.Both dont interfares so cant cancel each other.Look at it like this,if a 1 kg particle is in electromagnetic field , it will experience grav. force due to its 1 kg mass and electromag. force due to electromag. field present AT THE SAME TIME BUT BOTH DONT(RATHER CANT) CANCEL EACH OTHER.\n\nPlanes can be lifted by electromagnetic radiation if we made some electromagnetic radiation producing thing on earth and equip plane with a electromagnet also. But due to huge size of plane and different geographical conditions it is both difficult (read impossible) and impractical to implement and that when we can fly them much easily.\nBut the upper method is in use already in 'maglev' trains
555635
Simple -\n\nJust de-energize the levitating gyro.  The photons will de-polarize and the accelerating magnetic field will collapse.\n\nBut you knew all that, right? You and your trick questions, s-rebel - you are such a tease!!  But a fun one!
217325
Well, I know kids are very fascinated by steam powered locomotives, perhaps something involving the basic mechanics of how they move?  I'm not sure how detailed it would need to be for a 1st grade project, such has how the coal is burned to produce steam, which in turn forces the driving rods to move that propels the locomotive.  Wikipedia does a good job of describing the basics.
856622
Glad to see you're thinking, but this is an easily answered question.  \n\nTake for example a magnet.  Regardless of what is in front of your magnet it will still attract an object to a distance equal to its strength.\n\nex:\n\n.....(|)<<<< <[]<<<<<<<[]          \n\n......^..............^...... ......^\nMagnet......Metal..... ..Metal\n.................Object.... Object\n\nThe magnet is going to exert force on both of the objects without interference from first object.  \n\nBased on your definition of propagate...come to your own conclusion...that is the joy of thinking...we all have our own thoughts.
256568
1. The most common application of electromagnetism is something you see in every day life: Electric Motors. \nEvery electric motor (except some special purpose motots that have permanent magnets in them) use electromagnets called "poles" to produce north-south attraction forces to move the shaft.\n\n2. MagLev Trains: these trains use powerful magnets to levitate the train carriage to keep friction minimal. the magnets used are electromagnets\n\n3. Another useful application of electromagnetism is a CAT Scan machine. It is used in hospitals to scan and diagnose disease. Some parts of the body experience electrical currents. The stronger the current, the stronger the magnetic field. Advanced machines and scanning technology allow us :to pick up the magnetic fields; and identify where there is a higher frequency of electrical activity. \n\n4. electromagnetic Cranes are user to lift cars and metallic parts.\n\n5. umm cant think of nything else right now :)
952670
Conservation of angular momentum must be considered as PhysicsDude mentioned. The thing to keep in mind here is the speed of the train given is "with respect to the track". The train is moving in one direction and the wheel/track is the other. If the wheel were not moving the speed of the train would be the 0.15 m/s, however since the wheel is moving counter to the train, and observer standing by the track (that is moving on the wheel along with the track) would see the speed of the train as faster than the actual train speed by an amount equal to the speed of the track. \n\nVr = Vtt + Vtr\n\nwhere Vr (=0.15 m/s) is the relative speed, Vtt is the speed of the toy train, and Vtr is the speed of the track.\n\nNow, considering conservation of angular momentum\n\nLtt = Itt*wtt = Itr*wtr = Ltr\n\nwhere Itt is the moment of inertia of the train, wtt is the angular speed of the train, Itr is the moment of inertia of the track, and wtr is the speed of the track. The two equate since the intial angular momentum is zero so that the two must cancel each other out after the train has started moving. The moments of inertia are:\n\nItt = m*r^2\nItr = 1.1*m*r^2\n\nwhere m is the mass of the train (1.1*m is the mass of the wheel/track), and r is the radius of the wheel. Recall that the angular speed is the linear speed divided by the radius. This means that the above conservation equation is\n\nm*r^2*wtt = m*r^2*(Vr/r - wtr) = 1.1*m*r^2*wtr\n\nSolving for the angular speed of the wheel/track (wtr)\n\nwtr = Vr/(2.1*r)\n\nPlugging in the values given\n\nwtr = (0.15 m/s)/(2.1*0.43 m) = (0.15 m/s)/(0.903 m)\n\nwtr = 0.166 rad/s
268419
Methods\n\n\nDiamagnetism\n\nA substance which is diamagnetic repels a magnetic field. Earnshaw's theorem does not apply to diamagnets since they behave in the opposite manner of a typical magnet (relative permeability μr < 1). All materials have diamagnetic properties, but the effect is very weak, and usually overcome by the object's paramagnetic or ferromagnetic properties. A material which is predominantly diamagnetic will be repelled by a magnet, although typical objects only feel a very small force. This can be used to levitate light pieces of pyrolytic graphite or bismuth above a moderately strong permanent magnet. As water is predominantly diamagnetic, this property has been used to levitate water droplets and even live animals, such as a grasshopper and a frog. The magnetic fields required for this are very high, however; in the range of 16 teslas, and create significant problems if ferromagnetic materials are nearby.\n\n\n\n\nSuperconductivity\n\nDue to the Meissner effect, a superconductor also expels magnetic fields (μr = 0), much better than a diamagnet. Due to this (and flux pinning) the magnet is held at a fixed distance from the superconductor or vice versa. This is the principle in place behind EDS (electrodynamic suspension) magnetic levitation trains.\n\n\nFeedback control systems\n\nIf the position and trajectory of the object to be levitated can be measured, the field of nearby electromagnets (or even the position of permanent magnets) can be continuously adjusted via feedback control systems to keep the levitated object in the desired position.\n\nThis is the principle in place behind common tabletop levitation demonstrations, which use a beam of light to measure the position of an object. The electromagnet (arranged to pull the ferromagnetic object upwards) is turned off whenever the beam of light is broken by the object, and turned back on when it falls beyond the beam. This is a very simple example, and not very robust. Much more complicated and effective measurement, magnetic, and control systems are possible.\n\nThis is also the principle upon which EMS (electromagnetic suspension) magnetic levitation trains are based. The train wraps around the track, and is pulled upwards from below.\n\n\nOscillating fields\n\nA conductor can be levitated above an electromagnet with a high frequency alternating current flowing through it. This causes any regular conductor to behave like a diamagnet, due to the eddy currents generated in the conductor. Since the eddy currents create their own fields which oppose the magnetic field, the conductive object is repelled from the electromagnet.\n\nThis effect requires high frequencies and non-ferromagnetic conductive materials like aluminium or copper, as the ferromagnetic ones are attracted to the electromagnet.\n\n\nHalbach arrays\n\nAnother way of stabilizing the repulsive effect is to use fields that move in space, rather than just time. This effect can be demonstrated with a rotating conductive disc and a permanent magnet, which will repel each other.\n\nThis is the principle of the Inductrack maglev train system, which avoids the problems inherent in both the EMS and EDS systems. It uses only permanent magnets (in a Halbach array) and unpowered conductors to provide levitation. The only restriction is that the train must already be moving at a few kilometers per hour (about human walking speed) to levitate. The energy for suspension comes entirely from forward motion, efficiency is good, and no extremely low temperature suspension magnets are required.\n\nHalbach arrays are also well-suited to magnetic levitation of gyroscope, motor and generator spindles.\n\n\nGyroscopic motion\n\nThe reason a permanent magnet suspended above another magnet is unstable is because the levitated magnet will easily overturn and the force will become attractive. If the levitated magnet is rotated, the gyroscopic forces from spinning and precession can prevent the magnet fro
19579
magnetig breaking can be done in 2 ways.  like the electric cars you see you can use the natural magnetic force to generate electricity while the car is rolling but decellerating. the natural resistance will slow the car.\n\nmore effective is what they use to propell and stop maglif trains.  they use electro magnets not permanent magnets i assume you know oposites attract and likes repel. N= north S= south \n\nN+N repel \nN+S attract\n\non a permanent magnet you have to turn the actual magnet to repel or attract the other\n\nin an electro magnet you need only reverse the electro magnetic field.  basically \n\nso when you have a series of magnets all in a row you rapidly switch the field back and forth in time with the passage of the magnets over the other magnets.  to make the train go you turn the magnets polarity so it pulls to the south pole of the other magnet then as it passes you switch the magnet around electrically so it pushes away from the magnet it was just pulling towards.  electric breaking is just the oposite. as the magnets aproach you turn N toward N and as they pass you turn one so they become N to S  the approaching magnets push against eachother thus causing MAGNETIC RESISTANCE then as they pass you switch one so as they seperate you need more energy to seperate them thus slowing the vehicle.\n\n\nI know it was hard to follow but without being able to actually show you it is hard to explain
984706
Magnetic levitation transport, or maglev, is a form of transportation that suspends, guides and propels vehicles via electromagnetic force. This method can be faster and more comfortable than wheeled mass transit systems. Maglevs could potentially reach velocities comparable to turboprop and jet aircraft (500 to 580 km/h). Since much of a Maglev's propulsion system is in the track rather than the vehicle, Maglev trains are lighter and can ascend steeper slopes than conventional trains. They can be supported on lightweight elevated tracks. Maglevs have operated commercially since 1984. However, scientific and economic limitations have hindered the proliferation of the technology.\n\nMaglev technology has minimal overlap with wheeled train technology and is not compatible with conventional railroad tracks. Because they cannot share existing infrastructure, maglevs must be designed as complete transportation systems. The term "maglev" refers not only to the vehicles, but to the vehicle/guideway interaction; each being a unique design element specifically tailored to the other to create and precisely control magnetic levitation and propulsion.\n\nThe world's first commercial application of a high-speed maglev line is the IOS (initial operating segment) demonstration line in Shanghai that transports people 30 km (18.6 miles) to the airport in just 7 minutes 20 seconds (top speed of 431 km/h or 268 mph, average speed 250 km/h or 150 mph). Other maglev projects worldwide are being studied for feasibility.
290511
As a train runs, it is in contact with the overhead power cables. The train draws power and runs direct current motors, which in are coupled to the wheels. The wheels turn and the train runs. These trains also have regenerative braking systems where the energy lost during braking is recovered and are stored. This energy can then be supplied back to the overhead cables, when required.\n\nRecent advances use alternating current motors to run the train. The voltage is much higher in a.c. and is hence more energy efficient.
1169133
You'd have to have a magnet below the ground wouldnt you? I mean if you are saying the possible, then streets could have magnets below.That is-to hover. \nTo not hover the magnets would have to be there but opposing polarity and your other magnets would have to be enough to overcome the strength of THAT polarity.(And since I know little about ALL of what you're saying, wouldnt you have to have a capacitator in there somewhere to store the electricity that the auto generated?)\n\nBut I believe this is how David Copperfield "flies". He has some kind of magnet on him-large enough or something magnetized long enough-and an electromagnet in/on the ceiling of the auditorium. Then the electromagnet is turned on and voltage is controlled to raise and lower him but it moves and he follows.\nThe same with that street magician (Blaine?)-we dont see it, but is he stepping on a manhole cover with a magnet placed under?Do his shoes have magnets in the soles so that when he steps on the cover the two magnets repel so that it appears he is levitating? And he also spreads his arms apart or brings them closer-closing and opening a circuit, raising and lowing self?\n\nSo I believe if you can work the bugs out, streets can be paved with magnets powerful enough below ground but with enough insulation to not attract the small stuff.\n\nI just like your question. I know nothing about such things.
769618
go 4 d c motor ,,,, model of it is easy n interesting, eye catcher.... i made that last yr n got highest marks... :-)... it ll include both elec n magnetics..
1137048
Well it is certainly not a "perpetual motion" type of device. Magnets gradually lose their magnetism as their "disorder" increases. Their "disorder" increases when they contribute to "order" in ferrous objects in their proximity. Need to increase the "order" in your magnet? Wrap a coil around it and connect it to a DC source. Different materials will "retain" different amounts of residual magnetism ("order") after the power source is switched off. Natural magnets would have been exposed over centuries to small, but significant electrical stresses during their formation. They too would gradually lose it as their "disorder" increases. To answer your question - magnets owe it to electrical energy imprinted in ferrous memory.
779555
Hey! I just finished learning about active transport! The teacher confused me soooo bad! I had to have a friend in my class explain it to me. I would suggest going to google and typing in "active transport" and clicking on the news tab on the top. good luck with your project!
580607
Technically, anthing touching the ground is grounded.  A train is designed to take a lightening hit, with the exterior metal shell directing currents around internal passangers/freight and through the wheels into the ground.  No worries.