What is Pole: Definition and 364 Discussions

The North Pole, also known as the Geographic North Pole or Terrestrial North Pole, is the point in the Northern Hemisphere where the Earth's axis of rotation meets its surface. It is called the True North Pole to distinguish from the Magnetic North Pole.
The North Pole is the northernmost point on the Earth, lying diametrically opposite the South Pole. It defines geodetic latitude 90° North, as well as the direction of true north. At the North Pole all directions point south; all lines of longitude converge there, so its longitude can be defined as any degree value. Along tight latitude circles, counterclockwise is east and clockwise is west. The North Pole is at the center of the Northern Hemisphere. The nearest land is usually said to be Kaffeklubben Island, off the northern coast of Greenland about 700 km (430 mi) away, though some perhaps semi-permanent gravel banks lie slightly closer. The nearest permanently inhabited place is Alert in the Qikiqtaaluk Region, Nunavut, Canada, which is located 817 km (508 mi) from the Pole.
While the South Pole lies on a continental land mass, the North Pole is located in the middle of the Arctic Ocean amid waters that are almost permanently covered with constantly shifting sea ice. The sea depth at the North Pole has been measured at 4,261 m (13,980 ft) by the Russian Mir submersible in 2007 and at 4,087 m (13,409 ft) by USS Nautilus in 1958. This makes it impractical to construct a permanent station at the North Pole (unlike the South Pole). However, the Soviet Union, and later Russia, constructed a number of manned drifting stations on a generally annual basis since 1937, some of which have passed over or very close to the Pole. Since 2002, the Russians have also annually established a base, Barneo, close to the Pole. This operates for a few weeks during early spring. Studies in the 2000s predicted that the North Pole may become seasonally ice-free because of Arctic ice shrinkage, with timescales varying from 2016 to the late 21st century or later.
Attempts to reach the North Pole began in the late 19th century, with the record for "Farthest North" being surpassed on numerous occasions. The first undisputed expedition to reach the North Pole was that of the airship Norge, which overflew the area in 1926 with 16 men on board, including expedition leader Roald Amundsen. Three prior expeditions – led by Frederick Cook (1908, land), Robert Peary (1909, land) and Richard E. Byrd (1926, aerial) – were once also accepted as having reached the Pole. However, in each case later analysis of expedition data has cast doubt upon the accuracy of their claims.

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  1. Quantum Psi Inverted

    A rope, a pole, and some tension

    A rope wraps an angle θ around a pole. You grab one end and pull with a tension T0. The other end is attached to a large object, say, a boat. If the coefficient of static friction between the rope and the pole is µ, what is the largest force the rope can exert on the boat, if the rope is not to...
  2. Hak

    I How Does Diffraction Influence Shadows and Optical Observations?

    I have a couple of doubts about diffraction I'd like to clear up anyway The Sun's shadow cast by a tall pole embedded in the ground is less sharp at the top... How is this related to diffraction? Is it due to the presence of air? On Halliday, Resnick, Krane textbook it also says that...
  3. H

    I Magnetism: Same Pole Repulsion & Heteropolar Attraction

    We know that the two magnets have same-pole repulsion and heteropolar attraction; In most parts of the planet, a magnet is hoisted with a thin wire, one side of the magnet will point to the guide, and the other side will point to the north; If you come to the magnetic pole of the earth and place...
  4. S

    Determine eigenvalue-problem for steel pole

    If we assume that ##\psi## has a Fourier transform ##\hat{\psi}##, so that ##\psi(x,t)=\frac{1}{2\pi}\int_{-\infty}^{\infty}\hat{\psi}(x,\omega)e^{i\omega t}\mathrm{d}\omega##, then the wave equation reduces to ##-\rho\omega^2\hat{\psi}(x,\omega)=E\frac{\partial^2 \hat{\psi}(x,\omega)}{\partial...
  5. P

    Firefighter sliding down a pole

    First, I solved for the firefighters mass and got 82.9kg. Then, I plugged in the mass and the 1.8m/s2 acceleration into a=Fnet/m This is where I get confused. I think I'm supposed to use Fnet = F-fk to solve for fk (and that would be the answer?) but I don't know what to input for F.
  6. T

    I Pole mass and non stationary mass of a particle

    Is the pole mass of the particle it's characteristic mass? When particle physicists calculate the mass of elementary particles, like top quark, do they mean the pole mass? If not what makes the apparent mass of a particle different from pole mass?
  7. S

    MHB Balancing Weight on an 8m Pole: Find the Solution

    A man and a boy hold opposite ends of 8m long pole which is horizontal. A mass of 200 kg is tied to the pole. If the man is to support four times as much weight as the boy where along the pole must the weight be tied? Can someone please help
  8. S

    A Does the Z boson pole show up in the photon propagator?

    If I look at the photon propagator <A_mu (x) A^nu(0) > in momentum space, as I understand it I am to compute this by summing up all the self-energy diagrams of the photon, which look like: photon -> stuff -> photon In particular, since the photon shares the same quantum numbers as the Z, you...
  9. a sad student

    Tetherball rope wrapping around a pole

    My work so far is pretty basic, but I'm not too sure how to continue off from here. I haven't included the 2 dimensional aspect of it either, but I would presume that the rate of decrease in length is more sped up in that case? Would appreciate any help :(
  10. docnet

    Complex conjugate of a pole is a pole?

    This isn't a homework problem, but a more general question. Let ##f## be a function with two singular points ##r## and its complex conjugate ##r^*##. let $$f=\frac{g}{z-r} \quad \text{and assume} \quad g(r)\neq 0$$ so ##r## is a simple pole of ##f##. we have conjugates that are singular...
  11. docnet

    Find the order of the pole of a function

    I learned that ##f## has another singular point at ##z=1.715##, but i don't think this would be related to the pole at ##z=0## I tried substitutine ##u=2\cos z-2+z^2## and $$f(u)=\frac{1}{u^2}$$ has a pole of order 2 at ##u=0## which happens i.f.f. ##z=0## or ##z=1.715##. so ##f## has a pole...
  12. M

    Change the application pole of the moment of a force

    Good morning everyone! I am an aerospace engineering working on my thesis and i am trying to solve a little problem. In the picture you can see an "aeordynamic" body. The CFD analysis gives me the forces and the moments acting on this body. How can i calculate the momentum acting on the body...
  13. RH111

    I Pole in the Barn Paradox: Exploring Relativity of Simultaneity

    Hi all, I've been exploring the concept of the Relativity of Simultaneity. However, I cannot grasp the Pole in the Barn Paradox. Here is the video to the version of this paradox I am referring to: https://worldscienceu.com/lessons/11-3-the-pole-in-the-barn-paradox/ In this situation, the...
  14. H

    Compare the shadows cast by a pole in the river and a pole on the shore

    Is it because the speed of light is less fast in the water than on land as such leads to different in length of shadow?
  15. B

    4 Pole Induction Motor Working Principle

    Hello, I am studying the working principle of an induction motor. The attachment below (link) is a portion from Stephen J. Chapman's textbook (page 160-169). He proved the theory of the rotating magnetic field so well for a 2-pole induction motor from 160 to 164. However, on page 166, the...
  16. S

    B Jupiter's pole storms - potential relation?

    I just watched this beautiful video about resonance frequencies and saw a pattern (the pattern at 1:25) , that reminded me of the pole storms on jupiter: Image Credit: NASA/JPL-Caltech/SwRI/ASI/INAF/JIRA Could it be that some resonance frequencies on the pole of Jupiter are the reason why...
  17. B

    Pole vaulter landing on a mat

    Need to find normal force from the mat.
  18. E

    4 (insulated) wires from electric pole for underground 3-phase service

    Hi all. This is probably a simple question, but I am hoping for some guidance on why a service would be delivered with 4 wires as seen in the image. It appears fairly common around here (northeast U.S.), if not standard, for one of the phase-conductors to be 'double-tapped' and go underground...
  19. dRic2

    I Exploring Complex Poles in Functions and Their Consequences

    Suppose I have a function $$f(x) = \lim_{\eta \rightarrow 0} \int_{-\infty}^{\infty} d \zeta \frac {g(\zeta)}{x - \zeta + i \eta}$$ and suppose ##g(\zeta)## is a continuous (maybe even differentiable) function. Can ##f(x)## have complex poles of the form ##a + ib## with ##b## not an...
  20. R

    Pole placement design, Control Theory

    Summary:: Control Theory root equation pole Hi, I ran into a simple question but somehow I can't get it right. My work this far: ## G_0(s) = G(s) \cdot K \cdot \frac{1}{T_I s} = \frac{k}{\tau s +1} \cdot \frac{2\beta \tau -1}{k} \cdot \frac{2\beta^2 \tau}{Kks} = \frac{2\beta^2\tau}{s(\tau s...
  21. Remixex

    Contour integration around a complex pole

    $$\int_{-\infty}^{\infty} \frac{e^{-i \alpha x}}{(x-a)^2+b^2}dx=(\pi/b) e^{-i \alpha a}e^{-b |a|}$$ So...this problem is important in wave propagation physics, I'm reading a book about it and it caught me by surprise. The generalized complex integral would be $$\int_{C} \frac{e^{-i \alpha...
  22. jaumzaum

    B Behavior of compasses AFTER the magnetic pole

    So I know that a compass points to the south magnetic pole, that is near the north geographic pole. Let's consider the Earth to be a magnetized bar with all 4 poles aligned (for didactic purposes). The compass will try to "follow" the south magnetic pole, so, if I am in the Equator for example...
  23. E

    Why can't a 2 pole ac induction motor run a 6 pole induction generator

    I will use examples of actual products: 1) 3 hp (2.2kW) 3 phase 2 pole AC Induction Motor 3 hp/2.2kW three-phase induction motor features 2 poles, 2840rpm rated speed, and 7.4Nm nominal torque, with a working voltage of 380V 50Hz. Cheap 3-phase asynchronous motor has outstanding performance in...
  24. jisbon

    Free body diagram -- Ball rotating on one arm of a Y shaped pole

    To start off with, I can't seem to interpret the FBD here. Here are my drawing: and what I interpret as. From here, I feel like I can (it's wrong obviously but I'm not sure why) state that sin theta = o/h = o/mg = N/mg , so N= mg sin theta? Thanks
  25. telephonedude

    How do I calculate the tension on top of a pole?

    Let's say I have a 1 meter steel pole with a diameter of 10 centimeters standing upright, and I have a cement block of 30 cm length and 10 cm width and an assumed weight of 5 kilograms. If I place the cement block on top of the steel pole, assuming that neither the pole or the cement block tips...
  26. Quix270

    Magnet pole question in generation

    What would happen if a coil it’s exposed to a moving magnetic field with only north poles? Coils being exposed to only North Pole. Will produce alternate current or nothing?
  27. Christoffer B

    Imperfections in magnet pole pieces

    Hi all, I'm fairly new here. I'm currently designing an as-homogene-as-possible permanent magnet for low-field NMR and similar experiments. I'm on a fairly tight budget, and having finally found pole pieces for my magnets, I got them even though they have a small saw cut in the edge. approx. 5...
  28. J

    Energy required to change a sphere's axis of rotation OR pole location

    There is a disaster movie about a global cataclysm that results in Kilimantzaro becoming the north pole or something. Maybe this is plausible in terms of plate tectonics. Or maybe not. But I've got another question, a purely mathematical one: if the Earth were a solid sphere, no plates and such...
  29. V

    MHB Identifying Celestial Pole in Photo Taken 02/21/2010

    I took this picture on 02/21/2010, and I saw a line that I called it celestial pole. But I am not sure if that is what I see in the picture I took. I looked up wiki and I found that picture that the celestial pole is on the other side of the line that I see on my picture. How do I explain it...
  30. oflocksley

    I Circus physics problem (chinese pole)

    Hey everyone, so we are in the process of trying to create a rigging system for a chinese pole that does not involve fixed anchor points for performances. Our current idea is to use heavy enough objects to rig the chinese pole but we don't know how heavy to make these objects. This is a fun...
  31. I

    How Do You Calculate Forces and Balance a Hanging Cafe Sign?

    A 3 kg cafe sign is to be hung from 1 kg horizontal beam such that it is in equilibrium. The beam is 4 m long. A wire is attached to the beam at its right end to prevent the sign and the beam from rotating. The beam is pressed against the wall on its left end and is prevented from sliding by a...
  32. T

    North Magnetic Pole wandering away

    It has recently sped up to 30 miles per year, prompting a navigational update mostly for the North Pacific and Arctic regions. https://www.japantimes.co.jp/news/2019/01/12/world/science-health-world/north-magnetic-poles-movement-forces-unprecedented-navigation-fix/
  33. P

    Flag pole finding horizontal force component at hinge.

    Homework Statement A flag pole consists of a 80 kg rod of length L = 2 m with a 10 kg point mass attached to the end. The pole is hinged at the bottom and is tied to a horizontal cable as shown. 1. What is the x-component of F (Fx) exerted by the wall on the flag pole at the hinged point A...
  34. J

    Inverted Pole : Pole-Zero Diagram

    When analyzing a Bode plot or its transfer function the technique of "inverted poles" is sometimes used. I first became aware of this at lecture decades ago by Dr. R. David Middlebrook. While the basic method of using inverted poles in the mathematics is somewhat straightforward I don't recall...
  35. BeyondBelief96

    David Morin's Rope around a Pole example

    1. A rope wraps an angle θ around a pole. You grab one end and pull with a tension T0. The other end is attached to a large object, say, a boat. If the coefficient of static friction between the rope and the pole is µ, what is the largest force the rope can exert on the boat, if the rope is to...
  36. Grinkle

    B History question -- The choice of the North Pole being up or down

    The choice of the North Pole being up on a map is arbitrary as far as I know. Is it that way because publishing cartographers came mostly from the northern hemisphere? Is there some reason related to navigation (like Polaris being over the north pole) that might motivate even a southern...
  37. S

    Lenz' law: North pole of bar magnet moves away from a coil

    Homework Statement You have a circular coil, and two metal plates a and b. The north pole of a bar magnet is moved away from the coil at a constant velocity(assume the bar magnet and the coil lies along the x axis). On which plate will the excess positive charge appear? Homework EquationsThe...
  38. Mohammad Fajar

    Centrifugal Force Experienced at the Earth's North Pole

    If we standing in the equator, then centrifugal force caused by Earth rotation directly balanced by gravity force. But what if we standing in the high altitude or in the pole? In the pole at the distance like 40 km from north pole (so the north pole inside the horizon plane), the gravity have no...
  39. O

    Troubleshooting a 2 Pole motor running at low speeds on a VFD

    I run a small food manufacturing operation. We process nuts and seeds. We have several grinders/food processors that run at variable speeds. The speed of the motor is varied using an Emmerson VFD. The turning speed of the grinder is very low ( 50-100 RPM) arrived at using a sprocket and chain...
  40. F

    Only one pole in a horseshoe magnet

    Is it possible for a horseshoe magnet to have only one pole? For example, if i take a horseshoe shaped iron core and wind a conductor such that both the ends of the horseshoe have current flowing in the clockwise direction, then both ends are south poles. Is this possible? In that case how are...
  41. BillTre

    The North Pole is Above Freezing

    Temperatures at the North Pole are above freezing! Its winter at the north pole, and the sun won't raise there until March 20. There is also a patch of ice free water north of Greenland! Washington Post article here. This used to be unusual. The times they are a changing!
  42. E

    Charges pushed to the ends of a pole -- Faraday's law

    Homework Statement We put a pole with a length of 0.2m in a magnetic field equals to 0.4T and move it with a velocity of 4m/s. What is the value of the charges that accumulate in the ends of the pole? Homework Equations E=Bv ε=El The Attempt at a Solution I know that E=1.6V/M and ε=0.32V (Book...
  43. D

    Instantaneous center of rotation

    In absence of any other forces, if you push a free object not on the center of mass, during the application of the force (not after) should it only rotate around its instantaneous center of rotation (also called pole or center of oscillation/percussion)? Or it can also be subjected to...
  44. Sanborn Chase

    I What's the effect of solar pole reversal on the Parker Spiral?

    Does the 11 year magnetic pole reversal affect the sun's magnetic field configuration as manifested by the Parker Spiral? (BoB 2nd Ed., Page 380) How rapidly does the field this spiral describes decline? Is it an inverse square in attenuation? How does this affect Earth? Thanks.
  45. F

    What is the relationship between torque and pole placement in rotating objects?

    Hello, In the same frame of reference and using the same coordinate system , the magnitude of mechanical torque depends on the position of the center of rotation (pole): the lever arm distance varies depending on where the pole is. For static equilibrium situations, the net torque is zero so...
  46. R

    Do I need to consider normal force when sliding down a pole

    If someone was sliding down a vertical pole (like a firefighter) would only friction need to be considered to find out how fast the person is "falling" or is there also normal force from where the person is touching the pole, and would that affect the person's speed down? (I am ignoring air...
  47. S

    Calculating Stresses for Metal Pole Design in Audio System Installation

    I'm working on a public area audio system where we need to install our horn speakers on big height as per their installation requirements. We designed a metal pole as described: Pole consists of two poles: 1) a 7.5 meters height, 10" diameter, 6mm thickness. 1.5 meters are to be buried...
  48. Asmaa Mohammad

    The secretory pole in secretory cells

    Hello, I read that Golgi Apparatus when examined below the electronic microscope, appears a network of fibrils either apical or perinuclear. And it is apical when the Golgi apparatus is between the secretory pole and the nucleus in secretory cells. I don't know what exactly is the "secretory...