Important Definition and 539 Threads

Will not taking math classes beyond what's required for the physics major hurt me when trying to get into grad school for physics? At my school the only required math classes for physics majors are calculus I, calculus II, multivariable calculus, and differential equations. Also I've taken a...

Hello all, I'm entering my second year of university (Physics/mech engineering major) and am wondering whether it is worthwhile spending money on the textbooks? In my first year, I found there were some subjects where I didn't touch the textbooks - primarily Calculus I and II (Calculus...

Research, GPA, recommendation, GRE, etc.. There are many things to go to grad. Which one is the most important? One of my friend had very good GPA, but he did not get admission from any schools. His GPA was 3.95. Actually, his major was BIO, and he got all As from major, and only one B...

Why? (please read, this is the most important question i ever MADE!) Homework Statement Everyone know Earth orbit the su, however the orbit is not a full circular, but an oval... however then why won't Earth get stick into the sun? (when it get the close to sun?) where did other force that...

Hi everyone, I just watched an interesting talk from string theorist Brian Greene and he said something that really captured my curiosity. He mentioned that in the universe there is a list of about 20 incredibly important numbers that we have measured extensively. He then says that if those...

Even in my second semester of calc I have yet to see a situation where the extra step made any sense why is it important to write \frac{3\sqrt{13}}{13} instead of leaving \frac{3}{\sqrt{13}}. Its not a big deal but even my profs say its not that important so it has peaked my curiosity.

That's what my Precal teacher said, and so far I agree with him (though that's not saying much as I've only been exposed up to Precal mathematics). Do all of you mathematicians agree?

The poll allows multiple choices...which are your picks for the 2008 papers likely to prove most valuable to future research? The Uncanny Precision of the Spectral Action Ali H. Chamseddine, Alain Connes http://arxiv.org/abs/0812.0165 Loop Quantum Cosmology: An Overview Abhay Ashtekar...

Please help me solving this homework! 1. List three reasons why knowing the speed of sound is important to your life? 2. From at least three sources, gather information on how you can measure the speed of sound. then, describe the methods that are available to you. Information can be...

Hello, I am second year engineering physics major looking to go to grad school for either physics or nuclear engineering. Unfortunately my freshman year I decided not to do the honors curriculum because I had only took very basic high school courses and didn't feel prepared for it. How...

What was the the most fascinating or most important thing you've ever learned in Mathematics? For me the most amazing discovery was probably Calculus, and the introduction to graphs of functions. The most important thing I've learned in my life, is definitely Algebra.

So the topic is kind of vague, but allow me to expand: I'm applying for 10 summer REU programs for next year and I was wondering just how important the "memberships" category of my cv is. If I were to lay down $70 for a membership in both the Planetary Society and also the Seti Institute...

I'm a first semester junior with a current gpa of 2.77; my organic series last year really hurt me. I believe at the end of this semester I may be able to pull a 2.9 and after the spring a high 2.9, low 3.0. In addition, I plan to engage in undergraduate research. Assuming that I maintain that...

Which of these 3rd quarter 2008 papers do you predict will prove most valuable to future research? Significant papers tend to be cited more in subsequent research---we will soon have citation counts to go by, on some of these, as well as subjective judgment. Polling let's us share information as...

very important... at any group G show i)o(ab) = o(ba) ii) o(a) = o(cac^-1) c in G please i want solving

Starting from the equation dE=tdS-PdV+\mu dN It is straightforward to derive all 8 possible thermodynamic potentials. My question is the following: Why are the only important potentials Entropy Helmholtz free energy Enthalpy Gibbs free energy Grand potential ? Why aren't the other three as...

Do you believe that individuals may have a great effect upon the course of science and history in general as proposed by the 'Great man' theory? Or do you subscribe to Tolstoy's views that history is shaped by events that would have come about in any case regardless of the existence of a few...

Hey guys, I have no background in physics but have been interested in time dilation for a while and have understood the concept without getting technical... My question is this... this is the atomic clock experiment... Suppose there are only 2 living beings in the universe ... one...

I'm an Engineering Physics Major senior and I'm going to get my Masters in Mechanical Engineering. I have an internship in the Polymer and Coatings Department Analyzing Data. I am mostly going to be doing Fast Fourier Transforms and studying the data. The problem is I don't really know...

I know the conflicts between Israel and other Arab and middle eastern countries have been mentioned many times in PF. Rarely is it ever mentioned why we should continue supporting Israel . Since the 1970''s , the United states has given is a total estimate of 1.3 trillion dollars of taxpayers...

Do you think school should integrate classes that promote mental math and mental arithmetic, for example the ability to multiply two digit numbers in your head (say 15x19 or 14x17, etc). These things are critical and many people can't do them with severe brain gyrations! Do you think enough is...

Prompted by D H's post on inertial forces … … I've just read the fascinating wikipedia article on http://en.wikipedia.org/wiki/Fictitious_force" . I hadn't previously understood how important Coriolis force is, even over small distances. :redface: Coriolis force is (minus mass times)...

I'm asking because I'm going to be a senior next year and I really, really don't want to take AP Literature. I loathe English with every fiber of my being. I'm also taking German IV which I've heard is mainly going to be a writing/literature class and I don't think I can handle two similar...

Hey guys, next week I'm writing a very important test, so it would really help me if someone could solve the exercises. Here it is:

How can we justify that one life is more important than Another's? I've been wondering about this for a while now. I've tried tackling this from a religious and scientific standpoint. For religion I've looked at the Indian Caste system and at the Christianity belief that we should put...

Hi, May be a trivial question. But, "Why angular momentum is an important physical quantity in quantum mechanics?". Could anyone explain me?

Alright, so I'm about to take the AP Calculus AB Test (the College Board one, of course), but I have a question: Am I allowed to have any Calculus applications on my calculator? (My calculator is a TI-84 Silver Edition Plus, and it is approved.) I have a Calculus application that can do several...

Very important... Let R denote the set of real numbers. Find all nondecreasing continuous functions g : R → R such that g(x+g(y))=g(g(x))+g(y) for all x,y∈R

Very important! Homework Statement If A is an symmetric operator in separable hilbert space (H) and 1)A>=0 (which means that (Ax, x)>=0 for any x) 2)A(H) is a closed set How do you proove that \sqrt{A}(H) is a closed set Homework Equations The Attempt at a Solution Facts...

How important is practical experience with quantum mechanics for understanding, as best as one can, the subject? For example: Weinberg in his QFT tome, briefly discusses QFT three point interactions in terms of angular momentum states. So, he points out that the interaction can be formulated...

Which of these first quarter 2008 papers/presentations do you expect to contribute most to future research? 1. http://cift.fuw.edu.pl/users/kostecki/zakopane08/rovelli.pdf Looppy & Foammy: at long last, falling in love Carlo Rovelli This is Rovelli's report at the March 2008 Zakopane...

I love doing proofs, but hate doing computational questions. If I become very good with proofs but remain just so-so with calculational problems, can I still become a good mathematician? My favourite subject is topology.

If I take general chemistry 1 and 2 is that enough? I want to take more higher chemistry but in order to do that my school requires I need to take 3 semesters of organic chemistry -_- So how important is chemistry for this major?

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.