Important Definition and 506 Threads

Homework Statement I really need help with this problem. The question is: Each side of an equilateral triangle measures 3.61cm. A charge of -0.34mC is placed at each vertex. what is the potential difference at the midpoint of the base of the triangle? Homework Equations V=kq/r [b]3...

Homework Statement During the action potential, Na+ ions move into the cell at a rate of about 2.98×10-7mol/m2/s. How much power must be produced by the active transport system to produce this flow against a +25.2 mV potential difference? Assume that the axon is 11.7cm long and 19.6um in...

Hey. I'm teaching (trying to) myself calculus before i go to college. The book i got from my trigonometry seems pretty repetitive, but I was wondering which topics i need to learn. So far, I've learned limits, derivatives, applications of derivatives (I wasted about a month on the chapter...

Hi I'm studying maths, further maths, physics and chemistry A levels and I was just wondering which of them are the most important if I take up engineering. I think I can get an A in maths and possibly further maths, but I'm struggling with our physics syllabus and predict myself a C or below...

Dear all. My question, is about "Virtual Particles". I've read, that they appear out of nothing, and disappear in a very short time. How could this happen ?! How can something come from nothing ?! Or how can something go to nothing ?! What is nothing then ?! Does this violates...

I'm an aerospace engineer, currently job hunting, but I'm keeping myself occupied by refreshing my memory in c++ programming. I've had a course on it, but that was a few years ago, and I have mainly been using Matlab instead (for about 4 years now). I wanted to know, as...

Hi guys i must write about th PROTOCTISTA I must include the nucleu, starch granules, chloroplast etc. all of these I must explain what they do in the Protoctista... But I can not find the "STARCH GRANULES" PLEASE HELP ME CAN SOME one give me an Advice where I can find it... I was in...

In the following diagram: http://i19.tinypic.com/7xaa148.jpg A bullet of velocity 5 m/s hits an initially at rest rod. The mass of the bullet is 2kg. The rod rotates around its axis in its top, I=(1/3)ML^2. It's mass of 3. It's distance is 4m. The rod finally stops moving after the...

two question important ! 1) A hollow ball is rolling along a horizontal surface at 3.4 m/s when it encounters an upward incline. If it rolls without slipping up the incline, what maximum height will it reach? h= ...meter 2) A solid 2.4 kg sphere is rolling at 6.6 m/s . Find (a) its...

Our school requires the students to take FE exam before you graduate. I mean, of course, it would be helpful if you become a licensed engineer, but our school puts it as if you cannot get a job without passing the FE exam, which probably isn't true. Having that said, 1)How important is FE...

int^{0}_{t}[cos(sqrt{x}]dx can anyone tell me the solution to this question !

please help me to solve this problem thank you the largest-caliber antiaircraft gun operated by the german air force during wold was the 12-8-cm flak 40 .this weapon fired a 25.8-kg shell with a muzzle speed of 880 m/s. what propulsive force was...

Im not sure if this is the right place to post this question. That being said feel free to move if in fact this is the wrong place. I need to write an essay on mathematics in engineering and the importance of math in engineering. I need help finding website/articles/books/anything in realtion...

Hello everyone. i got one interesting homework. So... i need write about complex numbers. I already found many materials for that homework but... i stuck in one interesting point. I must write a pretty complicated task(teaser). i must think that task myself. Like simply task...z=a+bi---> 3+8i...

Lately I've been thinking about what are some of the best things I've learned and how valuable it is to us and what not. I'm really tired right now, so I'll just post up what I found to be the most important thing to me so far... well two things I learned. One valuable thing I learned is that...

Hi, Factoring is important in mathematics so I should know how to factor things. But I don't see how one should factor something! I have looked all over the web but I still don't get it. Could someone show me how factoring works? I would appreciate it. Thank you.

Very important new paper here. http://www.sciencemag.org/cgi/content/abstract/1138679v1 A little more descriptive: http://www.eurekalert.org/pub_releases/2007-05/teia-csh051107.php I think that this may fit a lot better to certain pet idea than to all the warming talk.

Hi! I`m poor student from Ukraine! I`m writing u becouse u are my last chans! So I need to do homewofk for monday-tuesday. I have problem becouse i was ill and siting at home during lessons about integration! Sorry for My bad English, but i hope u understad. So i have 10 integrals! At first i...

I understand that both of them are a huge factor of deciding admission to a graduate school, but which one is generally more critical?

I was wonder what you felt the important experimental discoveries in high energy physics over the past twenty five years have been? This is a subject I'm not familiar with and would like to do a bit of reading on my own. For instance, I imagine the possible mass of the neutrino would be on...

http://img82.imageshack.us/img82/8608/cimg7962cs0.th.jpg http://img301.imageshack.us/img301/7571/cimg7963pe0.th.jpg the second thumbnail is the figure of the question.. thanks..

OK, there is this problem which I need urgent help with. A separate user account was made on windows XP to do some very important work. Later on that account wasn't needed so that account was deleted. Unfortunately, the option chosen was to delete the user's files along with the account. And...

I have problems understanding why e is such an important number in the world of mathematics. The number pi ,for instance, equals the area of the unit circle and is the ratio circumference/diameter. Why exactly is e that important? I know that e is the base of the natural logarithm, but is...

Hello, I have been working very hard over the past few weeks and have managed to confirm a theory I have been harboring for a long time (mainly, that Einstein was incorrect about light and that it is in fact not a constant but varies according to the region of space you are in). This has...

I am stuck on this problem and I really need to figure it out or I will probably have to kill myself. Just saying. Also, I'm having the worst day of life, was fired from my job, and basically laughed at by my parents. Here is the problem: A 60kg person starts from rest and slides down the...

I'm a physics major but I'm currently attending a community college and i won't be able to transfer until I finish the spring term 2007 at a community college. I plan on transferring to the UC schools, but I'm not sure which one, and I want to eventually go to grad school and become a...

Reynaud and Jaekel's paper published in the Phsics ArXiv today: Long range gravity tests and the Pioneer anomaly (Report-no: LPTENS 06/46) (Laboratoire de Physique The'orique de l'Ecole Normale Supe'rieure) Garth

Resnick on pages 470 and 471 in Physics (4th edition) states that T = t/sqrt(1 - v^2 / c^2), where T is the time value (of an event) obtained by an observer using a moving clock, and t the value of the same event using a stationary clock. But A. Einstein on page 49 in The Principle of...

there's a couple of problems that i have to give in at the end of this lunctime that i just can't work out how to approach or what formulas to use: 1. A 70g tennis ball falls 2 meters and bounces back up to a height of 1.9 meters (a)How much kinetic energy does the tennis ball have...

Please double-check me! (checked) I'm not entirely sure of my math here, but this should be a simple calculation. I want to make sure I'm right, though, so I'm posting here. To which of the following bases is N = 252,505,670,761 a strong pseudoprime? {2, 3, 5, 7, 4086253}

I want to know in mechanics of materials what is the real objective of finding the deflections at various points in structures like 1)deflection in the end of an axially loaded bar 2)vertical deflection along the beam length 3)beam slope along the beam length 5)torsion bar twist...

This is something I thought I should do if nobody else would by the time I had learned enough to do it: gr-qc/0607068: Title: Dirac Quantization of Parametrized Field Theory Authors: Madhavan Varadarajan Comments: 33 pages Parametrized field theory (PFT) is free field...

Do you think it is important to take a physics lab subject for a whole semester if I am focusing on the theoretical side? Or would it be more beneficial to skip the lab and do more theory subjects in order to get a better grounding of the thory?

Everyday I try to do some changes in order to have a better life. I would like to know what has been the most important lesson(s) that pf members have learned throught their lifes.

Im planning to go to a university in America, and I took the SAT yesterday. I think ill also take the math subject SAT. I just wanted to know how important the SATs are compared to our school reports/grades and other stuff. In general I want to know what is important and what is not in applying...

According to the concept of space-time, we live in a 4 dimensional universe. But according to electro-magnetism and any other subject that uses imaginary or complex numbers, we express the world in 5 or more dimensions and assume they are imaginary, possibly because we have already seen they...

Good morning America, this is V speaking. If you haven't already figured it out you need to fast foward your clocks by an hour. That is all. ...End of Transmission...

I'm a student in a master's program, and of course I am working through the obligatory Jackson textbook. I can't help but wonder how useful this is going to be, how applicable. Let's face it, the book does little to further my insight into the actual physics. It's more of a treatise on...

To get into Masters or Phd in phsysics or maths do they look at your combined undergrad GPA or only the average of your third year subjects and honours (4th year) level subjects? Would it matter if they see a couple of fails for some second year nonscience subjects? Which would mean a lowish...

What's the relation (IMPORTANT)?? Hi guys, let me introduce my self, I'm a physicist studying in the university of aleppo... I want the relation between those number as a continuous function, my head is going to blow ! i can't find it, can anyone help? x->y 1->1 2->3/2 3->11/6...

Importance is hard to define when you take "survival' or "keeping up appearances" out of the equation. What makes something important beyond the fear of losing it or beyond the fact the the ego has made it important? What makes some things more important than others?

Cell Numbers Going Public JUST A REMINDER, on January 18, 2006 cell phone numbers are being released to telemarketing companies and you will start to receive sale calls. YOU WILL BE CHARGED FOR THESE CALLS! These telemarketers will eat up your free minutes and end up costing you...

I am majoring in EE and have the option of taking either of these classes. I have to take Calc 1-3, Ordinary DiffE, and Linear Algebra. So after these classes is PDE or Complex Variables more useful to electrical engineers?

Could you afford to lose your 'jump' drive? She found her master’s degree in a trash can Pretty good thinking and some persistence ... borne out of desparation, of course. :smile:

Browsing the homepage of WikiPedia, I came across this piece of information... 1675: Gottfried Leibniz demonstrated integral calculus for the first time to find the area under the graph of a function y = f(x) by using antiderivatives. Happy 330th B'day, Integration? :biggrin:

Ok I need me some super help. I have a term paper due next monday and things have just been piling on me like there's no tomorrow so I am barely getting a topic as we speak :cry: :cry: :cry: . So I need some suggestions here. I need an important figure to do a report on that was famous or...

Hey all, I have an assignment for physics that was due two weeks ago and I'm getting really desperate. It's called the 'airline project'. Here's a link to the assignment. I want to know how to go about starting and doing it. http://www.fiz6qed.org/homework/tests/take3.htm The percentages...

Just realized that this paper hadn't been posted here, and thought everyone might like to see this. http://xxx.lanl.gov/abs/astro-ph/0507619 Very interesting findings, not too hard to read. The ultimate point is that, traditional computer simulations of galactic rotation are done using...

I find it difficult for me to BS my way through something, some of my friends do it with ease. It is an important skill in life no doubt, what are some tips guys? :!)

Hi. This is my essay topic: Do questions like “why should I be moral?” or “Why shouldn’t I be selfish?” have definitive answers as do some questions in other Areas of Knowledge? Does having a definitive answer make a question more or less important? I realize that these questions regarding...