what is a pole reversal?
89051
On average, about once every 250,000 years or so Earth's two magnetic poles switch---the north magnetic pole becomes the south magnetic pole, and the south magnetic pole becomes the north magnetic pole. This means, among many other things, that compasses would all point south instead of north.\n\nScience knows that these pole reversals do happen. Some ancient rocks tell the story. In the far distant past these rocks were molten. At those times their interior materials would align themselves to Earth's magnetic field, much the way an electromagnet will. Careful analysis shows that the magnetic lines of force imbedded in these rocks often were directly opposite to Earth's present magnetic field.\n\nThe last pole reversal happened some 700,000 years ago, so we're sort of overdue for another one.
356220
Depends on your point of view. If you're hovering above the North pole, the earth rotates counter-clockwise. If you're hovering above the South pole, it rotates clockwise.
1122075
Not all rotors have pole faces projecting out from them.  Some have their rotor windings wrapped directly on the cylindrical rotor.\n\nMotors that have the projections on the rotor are said to have salient poles.\n\nMotors that do not have the projections are said to have non-salient poles.\n\nSalient in this case means projecting or "to stick out".\n\nSalient poles are used for rotors with four or more poles since I believe it is easier to manufacture for larger motors.  Salient poles also distort the rotor magnetic field a bit, making motors using them harder to analyze.\n\nNon-salient poles are used for rotors with either two or four poles.
793374
Mirror does not reverse the image instead you have reversed the mirror to make it to be facing you. Otherwise you cannot see your image in the mirror. That is you and the mirror is facing opposite means not in the same direction. Mathematically, there is 180 degree difference between you and mirror, which is inevitable. Therefore your left side is the right side of the mirror and right side is the left side of the mirror. Hence you miss feel that the mirror has reversed your image.\nAlso, as the angle of the mirror changes angle of the image also changes. when the mirror is kept horizontally at our leg image vanishes, inditacing we cannot see our own vertically inverted image in the mirror.\nNow, keep the mirror below the horizontal position from your leg, then you find your image is inverted as well as reversed. Here to keep yourself in the direction of the mirror you will have to make two kinds of rotation one in the horizontal direction another in the vertical direction at the rate of 180 degree each , totally 360 degree. So this difference between you and the mirror , image is appearing as reversed and inverted.\nOnce again, imagine  a tall building just on the bank of a lake. Image of this building in water of the lake looks horizontal or vertically inverted w.r.t .the position of the viewer. This is because of the total internal refraction of the light. Don’t confuse that it is not the image of the observer. \nIn the same way you can go on thinking and analyzing the several phenomena of reflection and refraction.
582397
The pole may be of any length.
1132644
The Sun has a roughly 11-year sunspot cycle, however, with the ending of each cycle, the polarity of the Sun's magnetic field reverses so that the North magnetic pole becomes the South and vice versa. Every 22 years we end up with the polarity returned to its 'previous' state. There have been many studies of what happens to Earth's weather when these flips occur, but to my knowledge, there has been no conclusive evidence that polarity reversal does much of anything. \nhowever for a given hemisphere, the overall magnetic polarity does not return to its previous polarity for 22 years; the Hale Cycle. It takes the Sun 22 years for the polarity in a given hemisphere to return to the same state.\n\nHope this helps.\n\nGood Luck.
783863
When a pole enters a hole, it produces either a pole or a hole. That is sexual reproduction. Whatever is produced without such entry is said to be asexual reproduction.
931729
It's not reversed, you only think it is. The left side reflects to the left side, the right side reflects back to the right side, same with top and bottom.
971038
Not necessarily, if an object is moving and wants to reverse it's motion,  acceleration is opposite to the direction of movement, the object slows down till it's velocity reaches 0 then increases to the opposite direction.\n\nAt the moment of of 0 velocity, the object is still although it has acceleration.
110263
The poles in the horshoe are close to each other , so , more magnetism
1108611
east/west.\n\nto remember, longitutde has lines that are all as "long" as each other (one pole to the other.)
513085
"The definition of Earth's magnetic poles depends on what is being defined. The "magnetic north/south pole" is the measured location of the vertical field lines. This is different from the "Geomagnetic north/south pole", which is the location where the best fitting dipole model pierces the surface of the Earth. While magnetic poles are not necessarily 180 degrees opposite from one another, Geomagnetic poles are exactly 180 degrees opposite from one another.\n\nThe magnetic south pole in 1990 was at 64.9 deg S 138.9deg E\n\nThe geomagnetic south pole in 1990 was 79.2 deg S 180.9 deg E "*\n\nDistance between Magnetic South Pole and Geographic South Pole (1990):    1456.8868 Statute Miles **\n\nDistance between Geomagnetic South Pole and Geographic South Pole (1990):   745.7051 Statute Miles **
286841
"The magnetic pole is located on Price of Wales Island in northern Canada (about latitude 73° N, longitude 100° W"\ngreat illustrations and explanation at the site below
136728
Seafloor spreading is pretty self explanitory--the seafloor moves causing plates above them to shift and move. Isoptic dating of rocks is figuring out how old rocks are and then matching them up along coastlines to see if they fit reasonably. Magnetic pole reversals...I learned but forgot...hope it helps some =]
145575
No it doesn't. It is expected to be pretty dull. \n\nThe earth has experienced hundreds of polarity reversals and none of them have been correlated with any sort of extinction event. There is no evidence of a change in climate brought about by the most recent reversal, and no evidence that the earth's tilt changed measurably. Monsoon records from Chinese loess deposits did not show any change in weather patterns attributable to polarity reversals. \n\nWhile we are statistically overdue, it may take another 2000 years before it happens, and there is just as good a possibility that the reversal will turn out to be an excursion and simply result in a restrengthening of the existing field. \n\nHere is a good site to read up on it:\nhttp://image.gsfc.nasa.gov/poetry/venus/RevScience.html
484193
You mean 2 P of a M which is 2 poles of a magnet.
474837
The direction of the north magnetic pole on the earth changes slowly over time. In addition, occasionally, the north and south poles reverse with the pole in the northern hemisphere becoming a south magnetic pole and vice versa. This can be recorded in magnetic rocks and even has utility as a dating method. According to our understanding right now, we are in the middle of such a switch. This is why the strength of the magnetic filed is decreasing. Anyway, a shift is when one of these switches happens.