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 Wysłany: Pią 15:37, 07 Sty 2011 Temat postu: tory burch boots How Maglev trains float _2438 |
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How Maglev trains float
East students, dare bring maglev train and airplane race may be in high spirits! You know? The speed of up to 500km / h, suspended in the air big thing is how natural pet float it? \to say. Yes! To make the train suspended in the air, the first method is to make the cross section of the train 'bayonet', shown in Figure 1. Below the mouth of the card installed solenoid, when the train in motion, to the solenoid is energized, an electromagnet magnetic attraction of the rail leaving the train suspension. Power Figure 1 Some students will ask: Can the same sex can not use magnetic repulsion principle, in the track and train magnets installed on the same name, also make the train float? Good! Creative, but requires a strong magnetic force of permanent magnets. Is used in practice buried in orbit connected through the solenoid. The train is also fitted on the bottom connected to pass electromagnetic Figure 2 iron. As shown in Figure 2, when the train starts, the bottom of the power train will produce a magnetic field magnet,[link widoczny dla zalogowanych], according to the relative motion, relative to the train tracks in the backward movement of the coil, the magnetic induction lines cut, the induced current. In orbit around the coil and the train at the bottom of the coil in the opposite case, the two parts will have the same name near the pole, so that the train levitate. And as the train accelerates, the orbit and the stronger the magnetic coil. In this case, the speed of up to 550km / h, and a considerable saving. Maglev trains, except by air resistance, the little touch with the track. So take comfort,[link widoczny dla zalogowanych], fast,[link widoczny dla zalogowanych], is the ideal future of transport. ▲ levers equilibrium condition is based on the quality of test objects, spring scale is based on the pull of the spring by the greater elongation of spring balance made the greater the truth, the object on the moon, still subject to gravity, on the balance scale disk drive on there is still pressure, hanging in the spring balance 'is also under tension when the spring balance, so the use of measuring the mass balance and spring scale measuring objects using gravity, the moon can be realized. Was chosen B. * Example 8 (Shaanxi Province), March 25, 2002, \Before the spacecraft from the rocket, and the relative hand - is static. Spacecraft capsule in the return process, and the dramatic atmosphere of friction, mechanical energy into - so that it can change the body into a ball outside the fireball. Resolution before the spacecraft from the rocket, the same position relative to the rocket, it is at rest relative to the rocket, the spacecraft capsule in the return process, into the atmosphere, acting to overcome the friction, so that tanks can increase the body temperature increased, reaching ignition combustion , so the appearance changes into a ball fireball. Therefore, this process consumes mechanical energy into internal energy. So were two empty fill: rocket; internal energy. Example 9 (Jiangsu Province, Yancheng) 2O02 in at 16:51 on April 1st, the \falling to the ground near the period of time,[link widoczny dla zalogowanych], due to the effect of air resistance do uniform motion, in the uniform down the process, it () 'A. The same kinetic energy, potential energy decreases, the internal energy increases. B. The same kinetic energy, potential energy increases,[link widoczny dla zalogowanych], the internal energy reduction. C. Kinetic energy, potential energy, internal energy increase. D. Kinetic energy increases, the potential energy decreases, the energy unchanged. Return capsule down in the uniform analytical process, the quality of the same, constant speed, height decreases, so the same kinetic energy, potential energy decreases, the analysis of known cases within 8 to increase. Was chosen A. ▲ coral of the first students of a factor one by one
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