Core Definition and 484 Threads

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...

I would like to know what is the function of soft iron core? Is there a difference in function when inserting soft iron core in inductor , motor , generator ? Thank you

I realize that soft iron is the most common material for this but I am wondering if there is something that will increase the magnetic strength. Here is what I have. Two electromagnetic coils in series connected by a yoke with a capacitor in parallel (for spark reduction). Cores are soft...

Wondering if anyone can give me a clue as to where I might look for information on what the best core material would be for an electromagnet if price were not an issue. I need as much magnetic strength as possible for between 3-9 volts DC. At between 80-160Hz. Basically this is a solenoid...

Hello all, I was wondering if anyone could help me figure out some differences between all the different types of processors out there for computers. I am a graduate student learning about CFD, and my advisor wanted me to check out some different processors because we would like to get new...

From http://www.nineplanets.org/uranus.html" : "Uranus is composed primarily of rock and various ices, with only about 15% hydrogen and a little helium (in contrast to Jupiter and Saturn which are mostly hydrogen). Uranus (and Neptune) are in many ways similar to the cores of Jupiter and...

How do we know the composition of the Earth's core? In addition, what is the current model for the generation of Earth's magnetic field? I'm curious to find out.

Does the core of the Earth belong to the Earth or did it come from outer space and collide with the Earth.In this scenario the volume of the moon added to the volume of the continental rocks should equal the volume of the core ( the collision would have displaced material from inside the...

Why does the Earth have a core and can a planet exist without one?

A Wikipedia article says: "The surface of the inner core exhibits rapid variations in properties at scales at least as small as 1 km. This is puzzling, since lateral temperature variations along the inner core boundary are known to be extremely small (this conclusion is confidently constrained...

I tried searching but I must've done something wrong, so... How do we determine what material is at the core of a planet? Do certain metals emit something we can detect? I really don't know how to phrase this in an intelligent way, so please bear with me. :biggrin:

Ferrite silcon (FeSi) core pros? & cons? I'm hoping for some input here to brainstorm. My unlearned theory is that a plyable substraight, in this case a cylinder, will allow the magnetic domains to come off of its' alignment when influenced to do so by an external force/field. The external...

please help me in understanding the following scenarios: 1. how could one approach first criticality in practice? 2. what would happen if we start-up with full power conditions from first criticality? 3. what would the shutdown requirement be in comparison to an equilibrium core? thank...

I need to find the integral of (x^2) 2 (secx)^2 tanx dx said aloud: x squared times by two times by sec squared x times by tan x I tried to use the [tex] function but failed misserably, hope you understand what i mean from what I've written above.

Hello All, I am trying to come up with the simplest (but most effective way to make a core (cylinder that is 5"OD x 3"ID x 2" tall) and I want to make it so that is has two separators on it so I can wind three separate coils on the same core. In case that was extremely confusing, I made a...

So what's the difference between these two technologies? seems to me they're almost the same, no?

If the Earth's core lost its heat, what would the temperature at the Earth's surface be? In other words: how much of our heat comes from the Sun, and how much from below? Assuming we had some other way to generate a magnetic field and the core burnt out, would we be able to survive?

Hello all, I'm running a stochastic simulator for chemical rate equations and I'd like to know how to specifically impelement a dual core solution on my AMD athlon 64 X2 4200+ processors. When I run the task manager with the simulator running, it is apparent that both cpus are running...

I've begun a study of the sun's interior and Emden's equation. Yet nowhere on the web does anyone divulge how to calculate the core radius or the inner core variables. One thing I did was to suppose a homologous polytropic core ( n = 3 ) with: epsilon = energy generation rate mean epsilon = L...

Amazing, after downloading my first thing with Bittorrent, this program is not working on my computer anymore. I obtain the error msg: Initialization Core Failed. I tried to re-install the program several times, even doing a restoring of my system, but nothing works. Any ideas? Thanks

Hi everybody, didn't really know where to put this thread since it's physics using math, so I'm sorry if it's not in its appropriate place. My problem is: I need to compute the mass of oil in a cylindrical core put into a core holder.it's partially filled of oil. I didn't know how to...

Doing a core 2 maths question, realized i can't remember how to find where a tangient and circle meet. The circle equation provided in question was x^2 + y^2 -10x + 9 = 0 same as (x - 5)^2 + y^2 = 4^2 Question was: "Given that line l with gradient 7/2 is a tangient to the circle, and...

Hi, I was just wondering if someone could point in the right direction to find formulas to calculate the natural resonant frequency of an LC oscillator circuit that uses and air core coil rather than a metal one. Thanks :-)

Ive been wondering about this for a while. i read in the newspaper about jupiters new red spot, but anyways they mentioned that it was a gas planet. does this mean that if you were to fly to Jupiter and keep going, eventually you'd go right through it and out the other side? or is it so dense...

Can anyone please explain why the inner core electrons for heavier elements would have relativistic momenta? I have not seen this clearly explained before. My thinking is: given the stronger coloumbic interaction with the nucleus (and e-e repulsion with the higher energy shells) that the...

I have noticed that the only processors that Intel makes that are both dual core and offer hyper threading are their Extreme Edition series. These processors are priced above nine hundred dollars! When do you guys think that they will sell a processor that offers both these features at a price...

WHen I was going to college I wanted one that focused mroe on Science,Technology,and Engineering. While I'm good at Science I'm horrible at English Lit. I could never pass it in High School. I don't liek History either. SO I was deciding on a college that was more based on Science and...

Hi, I have a quick question. I was just wondering which type of coil is best for inducing electricity. If I pass a magnet over one end of the coil, would a metal core help more current to be induced or would an air coil be better? Thanks, Jason O

Hi! I have one question about dams When building a dam with clay core you must prepare that core ( so the moisture would be optimal , geomechanical characteristics would be satisfied and that sort of things,don't have time to elaborate all) I have heard on lectures that there are two ways to...

If it is not urgent to upgrade your PC, you should wait for the 65nm and Dual Core 64-bit processor based PC/Notebook, it is a great improvement to cope with Windows Vista.:bugeye:

Saw this posted on another forum, and I'm not sure what to make out of it. :bugeye: :confused: http://www.msnbc.msn.com/id/11732814/from/RS.5/

I'm trying to understand what happens to a distribution transformer in relation to overvoltage conditions (in terms of saturation and current flow; not insulation failure). I understand that once the voltage has risen high enough to drive the magnetic core past the saturation point, that the...

A student wishes to light a lamp rated 12V, yet he has only a 2V rms a.c supply with variable frequency. So he attempts to step up the voltage by means of a transformer. Given Ns:Np = 6:1, resistance in the primary circuit is 70 ohm, inductance of primary coil is 0.3H, frequency f is 50Hz a.)...

We did a lab in my class where we put slices of potatoe into solutions with different molar concentrations of sucrose. Now, I am asked to find the osmolarity of the potatoe cores. How do I do this?

http://news.yahoo.com/s/ap/20051125/ap_on_sc/greenhouse_gas http://www.abc.net.au/science/news/stories/s1516607.htm http://www.newscientist.com/article.ns?id=dn8369&print=true

i hope this isn't in the wrong spot...if it is...could someone move it for me and let me know? For a while I have been working on an experiment to make a device I call the Psinetic Core (TM). I will give the implications of this device, but not its function, as I am not allowed to state theory...

Hello everyone, I'm missing this problem and i aksed the professor if i was doing it wrong and he said, nope it looks like you just use that equation and solve for I. Here is the equation: M = IA, where M stands for the moment; A stands for Area. So you know the Moment is 1022 J/T. You also...