Pole Definition and 368 Threads

In the pole and barn paradox, if the observer (person A) closes the both doors simultaneusly (with respect to himself), when he sees the runner's stick (person B) is just inside and keeps it closed forever after that, how will things happen, will the runner be traped or the door will hit the...

Hello this is my first posting. I have a device that I acquired from my old high school. It is a demonstration unit of AC and DC electricity generation. It has a small crank on one end. It is not equipped with permanent magnets in either the field or the armature. If I test the voltage off the...

Homework Statement a mass of 18kg is supported at the end of a horizontal beam hinged to a vertical pole, a cable at 32 degrees with the beam is attached to the pole to support the mass. Find the force on the cable, beam, and pole. Homework Equations f=ma The Attempt at a...

Why is a double pole switch used after the kwh metre in our houses and not a simple s

Hello again everyone, I'm in the process of winding/sourcing out coils to produce induced flux of one or the other pole orientation. I understand that when a coil is induced by a permanent magnet the resulting force will be opposite and equal to the force that caused it. So if one induces...

Homework Statement A ski pole is bent(plastic deformation) in three point bending by applying a load 2F perpendicularly to the ski pole. The forces at the end points are of magnitude F. If the pole yields due to plastic deformation at the mid point longitudinal span of the ski pole which is...

Hi there, I've been given this task to recognize the different types of power poles and their electrical equipments. The images are in the following link. I have encircled the equipments and components that are needed to be NAMED. http://www.geocities.com/flabberguest_gabcraft/powerpoles.JPG...

Recently I read a research about Polar wins saying that million of kilos of our atmosphere (Hydrogen, Helium and Oxygen) left the planet via North Pole. May be possible to build a hot hydrogen balloon to leave the planet via North Polo Win??

Homework Statement i have a question that involves geographic coordinates of a city and magnetic data here it is: compare geomagnetic and geographic latitude to determine whether a city is closer to geographic of geemagnetic pole. the geographic coordinates are 75.55W and 45.40N. the...

Homework Statement A jet plane flies due south over the north pole with a constant speed of 500 mph. Determine the angle between a plumb line hanging freely in the plane and the radius vector from the center of the Earth to the plane above the north pole. Hint, assume that the Earth's angular...

Homework Statement Ricky Bobby hangs a deer from a uniform horizontal pole as shown below. The Deer's mass is 57.6 kg, the pole has a mass of 12.1kg, and the length of the pole is 5.36m. The Deer is hung 1.92m from the point where the pole is attached to the verticle beam, and the angle of the...

Homework Statement Consider the radius of the Earth to be 6.38×106 m. What is the magnitude of the centripetal acceleration experienced by a person (a) at the equator and (b) at the North Pole due to the Earth's rotation? Homework Equations a = V^2 / r The Attempt at a Solution I...

Homework Statement A firefighter whose weight is 812 N is sliding down a vertical pole, her speed increasing at the rate of 1.45 m/s2. Gravity and friction are the two significant forces acting on her. What is the magnitude of the frictional force? Homework Equations Fk = ukFn uk =...

The alarm at a fire station rings and a 96.0-kg fireman, starting from rest, slides down a pole to the floor below (a distance of 3.55 m). Just before landing, his speed is 1.79 m/s. What is the magnitude of the kinetic frictional force exerted on the fireman as he slides down the pole...

Hi! This is my first post here. If I make any mistake, please tell me. I have a question: if I want to find a pole of a polynomial, ex: " a*s^2+b*s+c ", a,b,and c are constant given. I just use simple command: roots([a, b,c]), I can get the answer. However, if now I meet a situation is...

As I was reading Fabric of the Cosmos, I got stumped at the relativity of simultaneity section. This led me to Google for some additional explanation. I stumbled upon http://www.phys.unsw.edu.au/einsteinlight/jw/module4_pole_paradox.htm" which made me think of this question regarding the pole...

Hello everyone, I just read that in a loop of wire if the current is anticlockwise that part is a north pole. I'm just wandering what do they mean by this. I thought only magnets have north poles. Any help would be appreciated. Thanks :smile:

Which compass pole points to Earth's magnetic North pole? 1.depends where compass is located 2. compass doesn't actually point at Earth's magnetic north pole 3. north 4. south I'm stumped by this question. I think either 2 or 3 is the right answer, because they both seem correct to me.

http://news.nationalgeographic.com/news/2008/06/080620-north-pole.html

I'm attempting to get a rough estimate on how the shape of an electromagnet pole will affect the field produced. Most of the poles you see in labs are tapered, and not simply cylindrical - I'm wondering how this affects the field. After all, there has to be a reason why they would do such a...

In complex analysis, what is understood by the multiplicity of a pole? thank you

There's a principle that the electric field is stronger/more intense at the most pointed parts of a charged, non-uniform conductor. Does this principle also apply to magnets? I.e. if we have a non-uniform magnet, is the magnetism density (sorry for the lack of a more scientific word) greater...

Hi Suppose a closed feedback system has the transfer function \frac{C(s)}{R(s)} = \frac{G(s)}{1 + G(s)H(s)} In order to employ Nyquist's method to judge the stability of the system, I consider the loop gain L(s) = G(s)H(s) and map the s-plane contour into the L(s) plane. But what if there...

Consider a discrete-time LTI system with transfer function H(z) =(1-3z^-1) / ( 2-z^-1) (a) Sketch the pole-zero plot of H(z). (b) Suppose the system is stable. Determine all possible regions of convergence (ROC) for H(z) under this condition, or state that none exists. (c) Repeat part (b)...

Okay, 3 problems I can't seem to get the right answer for.. 1. A 2.30-m-long pole is balanced vertically on its tip. It starts to fall and its lower end does not slip. What will be the speed of the upper end of the pole just before it hits the ground? [Hint: Use conservation of energy.] GPE...

Occasionally I need to undrstand electric fields and I usually find an equation that allows me to solve my problem without understanding the solution. Dangerous but... Anyway I've encountered another field problem and now I'd like to understand the solution to the problem. Put in general...

why the aurora happens only in northern pole,why not in south pole...if it is because of the electrons of solar wind and Earth's magnetosphere then the same solar wind also got protons then why no aurora in south pole?

I want to know the x,y position at the time t of this system when I apply a force in the direction showed, how do I find it? http://img152.imageshack.us/img152/7937/systemfr8.gif

Hi, I'm working on a UHV STM. Recently I opened the multigain switch to set higher gains and I also changed the bandwidth. In the manual I read that the bandfilter is a so called 'single pole filter' and has a 6dB/Octave roll off. Can someone help me to understand what a single pole...

with an odd shaped magnet eg a cone .. apex = N / base = S is the strength of the magnet the same at each pole ?

My teacher asked a very interesting question. so given a runge function 1/(1+x^2) and i interpolate it on uniformly spaced point in the inteval -1 and 1 by p_n(x) How does the pole -i and i contribute to the oscillation of p_n(x)? I never thought pole would come into play.

I read a couple of tutorials on electromagnetism and solenoids but there's a good few questions left unanswered. 1.) What determines the poles of a solenoid electromagnet? Let's say I have direct current flowing from the left end of the coil to the right. Will the north pole automatically be...

A tether ball leans against the post to which it is attached (Fig. 5-40). If the string to which the ball is attached is 2.00 m long, the ball has a radius of 0.300 m, and the ball has a mass of 0.400 kg, what are the tension in the rope and the force the pole exerts on the ball? Neglect any...

Homework Statement Q. Use residues and the contour shown (where R > 1) to establish the integration formula \int^{\infty}_{0} \frac{dx}{x^3+1} = \frac{2\pi}{3 \sqrt{3}} The given contour is a segment of an arc which goes from R (on the x-axis) to Rexp(i*2*pi/3) Homework Equations...

Hi, I have an electrically-actuated shutter that can be either in the "closed" or "open" positions. I want to use optoelectronic switches (slotted switches with an infrared LED source and photodiode detector) at either end that will detect whether the shutter is closed or open. The opto...

How exactly would one go about proving that \frac{1}{1-2^{1-z}} has a simple pole at z=1? I've tried writing 2^{1-z} in terms of e to get a Taylor series for the denominator but can't quite figure out where to go from there.

this thread is about the 1 light year long pole question, the thread was closed... the question was " if there was a pole that is 1 light year long...person A at one side and person B at another" if person A pushes the pole, does person B see it instanteously... most people said that it...

A pole one light year long... laying in bed last night I had this question pop into my pointy little head. If I had a pole one light year long sitting between points A and B and I pushed it forward one foot from point A toward point B how long would it take to move at point B? I've...

One quick question about forces i have. Would an appear appear to weigh heavier at the equator or at the north pole? I assume both places would have have the same weight. A little feedback would be appreciated

Homework Statement Explain how you would determine which was the north pole of a bar magnet, without using any other magnet. Homework Equations none The Attempt at a Solution If it's small enough you might be able to make it into a compass like object but if its heavy than the...

The pole in a lake! There is a pole in a lake. One-half of the pole is in the ground, another one-third of it is covered by water, and 12 ft is out of the water. What is the total length of the pole in 'ft'?:bugeye:

I'm calculating the order of a pole of some function and I'm wondering: is it possible that a pole has order infinity?

Hello, I am trying to analyze the following situation: A tetherball is kicked with velocity of v meters per second at time t=0 seconds. The length of the string attaching the tetherball to the pole is l meters. The radius of the pole is r. Assume no gravity and no air resistance so that the...

What happens when you do a KVL through and current source? A formula I can not understand ns=120*f/p f=frequency P=number of poles ….. How shall you know how many poles you got?, my old teacher just wrote it down as it would be obvious. But I think ti is related to what kind of...

Why does the north pole of a magnet attract to the north geographic pole of the Earth?

A tether ball leans against the post to which it is attached. The string is attached to the ball such that a line along the string passes through the center of the ball. The string to which the ball is attached has length 1.50 m and the ball's radius is 0.105 m and has a mass of 0.266 kg ...

A firefighter with a weight of 712 N slides down a vertical pole with an acceleration of 3.00 m/s^2, directed downward. What are the magnitudes and directions of the vertical forces (a) on the firefighter from the pole and (b) on the pole from the firefighter?? I think the magnitudes would be...

I hope some of you will be able to help me. First, let me make sure I have this right. From what I understand, the five Pole Stars are: Polaris Al Deramin Deneb Vega Thuban My question is, what was the Pole Star between 9,000 BC and 10,000 BC? The length of time for each Pole Star...

Here I must evaluate \frac{1}{2\pi i}\int_C \frac{f(\zeta)}{w(\zeta)}\frac{w(\zeta)-w(z)}{\zeta -z}d\zeta where f is holomorphic on the hole complex plane, where w(z) is a polynomial of degree n with all of its zeroes distinct (i.e. all n have multiplicity 1), and where C is a closed curve...

I want you to help me settle an arguement. Is it possible to have a center-pole magnet? That is, a magnet with one pole at the center, and the other pole facing out in every direction? I think that it isn't, because the molecules would force each other to all face the same direcion, or all of...