Core Definition and 469 Threads

Peace Core+ Physics Undergrad = ? Grad school? So, I am two years younger than the rest of my undergraduate peers. I will graduate from undergrad at age 19, hopefully with a decent GPA and high GRE scores (I usually do well on standardized tests), as well as research experience starting from...

Wikipedia has an Ivy Mike level nuke at 530 TPa, and the core pressure is at 380 GPa. That's a factor of over 1000 times. I'm wondering whether these are exactly comparable, since the pressure at the core is constant, whereas in a nuke, it's relatively brief. A multi walled carbon nanotube...

I'm using PV cells to energize an air core coil. Is there a method in which I can determine the maximum length of 32 gauge magnetic wire to use, so that I don't use too few windings and burn the coil out or too many windings limiting its' potential. I'll be using 2 PV cells that are each rated...

I know that the mantel of the Earth is kept hot by radioactivity, but is this also true for the core?

Will an entrance level Intel Core I7 920 be faster than a Core 2 Quad Q9400? Just asking...

Hello all, lets think we have a segmented gamma-ray detector. when a gamma-ray interacts several segment of the detector, it deposits energies in each of them. And we can get a energy spectrum due to this gamma-ray. is the signal from core of the detector or from segments? what is the meaning...

This is a bit of an odd question, but it's been bothering me for a while. The graduate sequences at top universities (Algebra, Geometry/Topology, Analysis) have always been rather esoteric in nature. Most students entering top universities have a rather strong background in these topics and...

Homework Statement A planet with R=4000km and \rhoavg=5g/cm3. The planet is made of quartz all the way to the core, which is made of iron. The densities of quart and iron are \rhoquartz=2.65g/cm3 and \rhoiron=7.874g/cm3. Calculate the radius of the core. Homework Equations \rho=M/V...

Hello all, I have problem with name of type of matrix. The definition is next: The core of matrix A is collection of vectors x, for which is valid Ax=0. Does anybody know the name of this type in english language. Example will be also good. Thank You

A magnet is attached (or over a small airgap) to the end of an electromagnet (EM) with a steel core, then the EM is pulsed with just enough juice to get the magnet to drop off. (just negating the attraction) Which will require less energy input to get it to drop off? 1) a high permeability...

Hi, i have a question about Earth's core. How does it keep on going (endless)? i mean will it last forever, and if it doesn't what will happen when it burns out? Do the other planets in the solar system have cores? Question 2: if we managed to get carbon dioxide to heat up mars, could it be...

I'm trying to get feedback on electromagnet design and specifically sourcing premium core material for a pulse coil electromagnet. I have seen this question asked a few times on this forum, but doesn't appear to have really been answered. What is THE BEST core material and where to source...

I am a student at Colorado State. Can someone in this forum help me with building an AC coil either an air core coil or C-frame iron or steel with so many turns of copper wire that has a maximum magnetic field of 0.2 T and its frequency range is 100KHZ to 100MHZ. I am searching on the internet...

1. Homework Statement A long solenoid with 70.0 turns of wire per centimeter carries a current of 0.100 A. The wire that makes up the solenoid is wrapped around a solid core of silicon steel (Km=5200). (The wire of the solenoid is jacketed with an insulator so that none of the current flows...

Homework Statement A long solenoid with 70.0 turns of wire per centimeter carries a current of 0.100 A. The wire that makes up the solenoid is wrapped around a solid core of silicon steel (Km=5200). (The wire of the solenoid is jacketed with an insulator so that none of the current flows...

As I understand it, a beamed core antimatter drive would produce thrust by annihilating matter and antimatter and ejecting the results of the annihliation via a magnetic nozzle. The usable results would be charged pions, which would decay into muons, correct? So my question is, if a...

Hello:cool:o! I wanted to know that why do we use a soft iron core in an inductor?

the wife does printing grafixs and wants to have several programs open at the same time like photo shop, illustrator, paint and others will a 4 core CPU be better or a faster 2 core CPU be better I have heard that most programs do NOT use more then one core at a time but will each open...

I'm curious as to why there aren't heavier metals in the Earth's core than iron and nickel. Why those two? Anyone have any insight?

Thunder in relation to Earth's core. Is there a relation to how the Earth's core revolves and circulates regarding thunder? What if one would track the amount of energy beeing surged and what direction it might seem to be heading, if has a direction? Is there a inderect link between lightning...

http://www.sciencedaily.com/releases/2008/06/080619102553.htm One wonders what other effects those rapid changes may have on the Earth mantle, considering heat and mass distribution and ultimately the dynamics of the Earth in total. Could any of the 'not understood' phenomena from the...

"The Cavradyne engines were based on the assumption of years of research and development, during the 1980s and '90s, of gaseous core nuclear reactors and high-temperature ionized gases. Theory was presumed to have shown that gaseous uranium-235 could be made critical in a cavity reactor only...

Hello! This is my first post on Physics Forums. Seems like a good community. I will endeavour to contribute. Over the next few weeks I will have to build a test rig for a fiber-optic sensor I'm developing. The sensor is for high magnetic field strengths, so the test rig must essentially...

Homework Statement Astronomers have observed a small, massive object at the center of our Milky Way galaxy. A ring of material orbits this massive object; the ring has a diameter of about 15 light years and an orbital speed of about 200 km/s. Take the distance of one light year to be 9.461 X...

I understand that most scientists believe that the Earth's core is composed of iron, nickel and perhaps some other elements such as sulfur and oxygen. I also understand that they believe that the Earth's core formed during a time when the Earth was molten and that the core was formed by heavier...

A 0.380 m long cylindrical capacitor consists of a solid conducting core with a radius of 1.15 mm and an outer hollow conducting tube with an inner radius of 2.05 mm . The two conductors are separated by air and charged to a potential difference of 6.40 V . Calculate the charge per length for...

Last night I watch a show about the birth of our sun on the Science channel. At one point they talked about how it takes thousands of years for the light in the suns core to travel from the center to the Corona "outer shell", and then only 11 minutes for the light to travel from the Corona to...

I ran across some article that pointed to this research: http://www.omatumr.com/picpages/snexplo.html The theory states that Sun formed from accretion of supernova remnants back into/onto its core. Now, my scientific background is quite limited but this theory seems to me more realistic...

You are visiting a new planet with radius of 5000km. You set up a seismic network and detonate a test chare at the north pole at time T=0. At time T=24minutes your instruments detect S-waves at a latitude of -60 degrees. No S-waves are detected south of -60 degrees. what is the size and...

Can anyone tell me who introduced the NCSM and what year was it introduced?

What would it feel like to stand in the core of the earth? I was thinking since there would be like pressure coming from one one side, and pressure coming from the other, you would feel skinner. Plus it would be cozy ^^ Although I guess it would be sort of shaky and make you woozy because...

1 Why does the Earth's core spin in relation to the crust? 2. How quickly are viscous effects slowing it down, if it actually is slowing down? -deCraig

If Earths core cooled down completely what would be the effects on the Formation of Earth? I think that eventually, over millions of years, the enitre surface of the Earth would be covered in water, a huge ocean. There would be no new mountains being formed, and eventually errosion from rain...

I'm really putting some effort into understanding the core idea behind determinants. For a 2x2 matrix, I obviously saw how to derive the formula for the determinant (using AA^-1=I). The question is, how did they define the |A| for higher order matrices? I'm reading a textbook on linear algebra...

Kevin Vandersloot is an Ashtekar PhD now at Portsmouth UK with a EU Curie fellowship. He and another EU postdoc, C. Boehmer, have been studying the interior of the LQG black hole. As we know, the big bang can be modeled using LQG and it gives no singularity (no place where the model blows up...

ok here's the deal. i had a computer with a Core Duo T2250 1.73 GHz processor. a replacement computer that a company is sending me is a core 2 duo rated at 1.66 ghz. i told them to find another one because the processor is slower than my old one. but they called me back saying that the 1.66...

Hi. Could someone please explain to me the following C3 level trigonometry question? I would really appreciate any help as I am completely stuck at the moment. Express tan2x/(1 - ((tan^2)2x)) in a more simple form. The answer in the back of the textbook is (1/2)tan4x. Thank you. Cathy

What is the current carrying capacity of a 1000 sq. mm. 3&1/2 core alluminium cable laid in air [in case of single run, in case of double run...]??

Hi. Could someone please tell me the method to use to simplify cosBcosB + sinBsinB? Any help would be really appreciated. Thank you. Cathy

Will the impedance characteristics for a length of stranded conductor be really close to an equivalent length of single core conductor? For example, can you expect the same impedance from a 20 ft. run of 12 AWG single core as you would from a 20 ft. run of 20 AWG stranded conductor? I know...

Hi. Could someone please help me with the following question? I would really appreciate any help as I am totally stuck at the moment. ln (2y - 1) = 1 + ln (3 - y) Is the answer: y = (e + 4) / 3 ? Thank you. Cathy

Hi. Could someone please help me with the following question? I would really appreciate it as I am really stuck. Express (x + 4)/(2x^2 + 3x + 1) - 2/(2x + 1) as a single fraction in its simplest form. I got that [(x + 4)(2x + 1) - 2(2x^2 + 3x + 1)]/(2x^2 + 3x + 1)(2x + 1) = (-2x^2 +...

Why are all of the reactor core rod assemblies I see in an overall hexagonal arrangement with rods of uniform cross section (I assume due to modularity and mass production benefits)? Could not some abstract and variable rod cross-sections produce a more efficient reactor?

A power transformer manufacturer decided to decrease their production budget by reduction of material amount used in transformer construction. In that country, transformer core material is an expensive portion of power transformer because it shall be supplied by foreign companies. Therefore...

i currently have a core 2 duo E6600 2.4 GHz processor. during some applications(obviously games n few of my simulation programmes), i have noted that only one of the core works. why is it so?? in few other applications(now too some games n application), both the cores share the load. is it the...

I already have XP on my PC, And I want want to install Core 7 too. I have only one physical Hard drive, few hours ago it was partitioned into 3 NTFS drives ( C D E ).What I just did is that I removed the partition of E: ( it was already empty ), so now I have about 40GB of unpartitioned space...

A power transformer manufacturer which was located in economical boycotted country met some problems in material provision. The core material and some other things shall be supplied by a foreign company that they work under its license. While boycotting duration they got to use inferior...

Hello, this is my first post here. I'm building an electromagnet as part of a larger experiment in my lab. My magnet needs to move a magnetic thread made with a paramagnetic substance. This string just barely responds to strong magnetic fields (tested it with standard speaker magnets). The...

What does the "effective core area" of a fibre (or fiber) optic mean?

Dear all, I know that I can create a uniform field using the design of a Helmholtz coil with an air-core. However, if I use a ferrous core like iron, will I still be able to create a uniform field under the same conditions? Also, how is the equation for the magnetic field, B, changed when...