What is Intro: Definition and 563 Discussions

Intro Thermodynamics--put ice in water Homework Statement (a) Two 45 g ice cubes are dropped into 290 g of water in a thermally insulated container. If the water is initially at 25°C, and the ice comes directly from a freezer at -15°C, what is the final temperature at thermal equilibtrium...

1. Suppose a constant potential energy,Vo, independent of x and t is added to a particle's potential energy. Show that this adds a time-dependent phase factor, e^{-iV_ot/\hbar}Right now I'm completely lost. Here's what I think so far: 2. i\hbar\frac{d\Psi}{dt} =...

Hello everybody, I got two questions on my assignment that I am stuck on...it'd be great if you guys can give me some hints to get me in the right direction. :smile: 1) Using the uncertainty principle, find the minimum value (in MeV) of the kinetic energy of a nucleon confined within a...

Ok I've done an introductary course in analysis using the first 2/3 of Parzynski and Zipse - Introduction to Mathematical Analysis. This (I think) is about equivalent to Rudin up and including chap 7 (series of functions). I probably won't have time to take any more classes in mathematics as...

Howdy all! I'm really interested in physics and I'm looking for a really good introductory phyics book. Since it might be asked I've only had a algebra one and a semester of geometry. I pretty certain that I can teach myself algebra two and pre-calc. So any suggestions?

Can anyone reccomend me a good book and introductory electrical engineering circuit analysis? I currently have Basic Engineering Circuit Analysis by Irwin/Nelms, but am not too fond of it. Thanks

I need to design a voltage regulator circuit to provide a constant voltage of 5V to a load from a variable supply voltage. The load current carries from 0 to 100 mA and the source voltage varies from 8 to 10 V. You may assume that ideal Zener diodes are available. Resistors of any value can...

I'm in 3rd year intro to quantum, and I just got a 56% on my midterm. I'm looking for more material because my current textbook is Intro to quantum Physics by French and I really don't like it. I've had certain people recommend Griffiths but unfortunately my school's library doesn't have it. I...

Hi, I am doing the Discrete math course in high school and we are doing some analynical math concepts like vectors, cross product, dot product, line equation in the form of r = a + tm, plane equations in the form of r = a +tu +sv, intersection of lines and planes and planes and...

Hi, I am currently a student in a university... my teacher is going over quantum physics which i don't understand a bit... i mean i understand the uncertainty principle but i want a book with more mathematical (not too complicated math) and physics treatments, explanations without using calc 4...

EASY STUFF: Impedence, pitch, vibration, reasonance... Please Help! I would really appreciate it if you guys could take a look at these problems I have difficulty with. Thanks a lot. My answers are in red. 1. As impedance decreases, frequency decreases? 2. For the vibration spectrum (of...

http://www-conf.slac.stanford.edu/ssi/2005/lec_notes/Carroll/default.htm It's very fast & he doesn't really pull any punches. Still, it's good for motivating anyone with a strong interest in "the real stuff" & not just the pop cosmology.

I wonder if anyone might have some suggestions for a good self-study book on tensors. I'm just starting in on Jackson and have only seen tensors briefly in my previous undergrad classes. Any suggestions?

valid proof? (Intro to Analysis) Hey all, Great forum here! I am working through "Elementary Analysis" by Kenneth Ross in preparation for an intro to analysis course I am taking in the fall. I was wondering if the following is a valid proof? Included are the axioms I used in the proof, but...

probably some of us need to get more familiar with the DeSitter group SO(4,1) the best online introduction I know is a few short paragraphs towards the end of Baez TWF 235 http://www.math.ucr.edu/home/baez/week235.html you have to scroll down about 5/8 of the way. on my printer it is...

Hi, I'm looking for a good introduction to Quantum Field Theory. I will be using what I learn from the book in postgraduate research and need to learn both the maths and concepts of QFT. As for my background in QM you can assume I have read Griffith's "An Introduction to Quantum Mechanics"...

I am just reviewing some E&M because i took the class before I ever thought i had that big of an interest in physics and just memorized formulas, etc. Anyway, this is from a "which of the following statements is true" question. The true statement is: A positive charge experiences an...

I'm wondering if anyone can recommend a good intro to complex variables book for an undergrad (calc1-3,diffeq). Preferably something that can be found cheap on amazon (Dover?)

I have obtained a copy of this book and I am having a very difficult time understanding it. My problems start at the bottom of page 38 and continue through the middle of page 41. For instance: The last thing on page 38 is a definition of a scalar field in terms of an equation. The first thing...

Our professor gave us three questions for our exam tomorrow, I was wondering if anyone would check my work for me. I just want to make sure I am doing this correctly. Thanks in advance. 15) Which of the following species has the largest atomic size: (a) S^{2-} (b) Cl^{-} (c) Ca^{2+} (d)...

intro to DIFF EQ (help!) a drag chute must be designed to reduce the speed of a 3000-lb dragster from 220 mph to 50 mph in 4 sec. Assume that the drag force is proportional to the velocity. a) what value of the drag coefficient k is needed to accomplish this? b) how far will the dragster...

Hi Can someone please explain to me Eq 2.30 in Schroeder's and Peskin's book? (page 21) how does he simplify the long equation of the commutator to this delta distribution? \imath\delta^(^3^)\ (x - x') Thanks

I'm not sure that this is the right place to post this, but anyway, I wanted to know if there were any good books for an introduction to theoretical physics. The level I am looking for is undergraduate/high secondary school level (Those who are not English, that means 17-18 years old). I'm doing...

Hi: I would like to get a mathematically rigorous "introduction" to QM. Which books would you recommend?

Does anyone know an especially good book/textbook on quantum mechanics that is written for an audience with first year physics knowledge? I will be donig 2nd year QM next year so a book that describes QM well but obviously not a thorough treatment. Thanks

Introductory Astronomy & Astrophysics by Zeilkik and Gregory 4th edition. What are your opinions on this book? As far as I know the field has changed dramatically over the years and I was wondering if I should get a better or newer book since it was published in 98. I also heard it had a...

Author: Dr. Donald Luttermoser of East Tennessee State University

Hi all , I have 2 questions, I don't know how to derive the equations, please help. Thank you. 1)A reversible adiabatic expansion of 2.5 moles or He from a volume 9L at 300K to a final volume of 28L. Find work(W), heat(Q), internal energy(U) and enthalpy change(H) and final temperature. (He...

I am having trouble with 2 problems about the harmonic oscilator. First of all the question tells me to use the wave function for when n=1 So I have: Wavefunction = A[1]*r^1/2 * x * e^-((r^2)/2) where r= (mw/(hbar))^1/2 I am wondering when I am multiplying this by the complex...

To many this would be a simple plug it into equation problem. But for some reason this just isn't clicking for me. Here's the problem: An open elevator is ascending with a constant speed V of 32ft/sec. A ball is thrown straight up by a boy in the elevator when it is a height h of 100 feet...

Hi Guys, I am new to Electrical Engineering and am trying to figure out the voltages for (1) (2) (3) in the link below, assuming that a 5V dc power supply is connected to the terminals on the left. I am new to Elec Engineering and am struggling a bit. I thought to try Node Voltage analysis...

Hello everyone, I am a CS major who will be taking an Introductry course in EE specifically designed for non-EE majors. It covers analysis and design of passive and active circuits. I know that the prerequisite to the class is calculus and engineering physics (electromagnetism). I took the...

Hi i just need some help on how to get started with these problems because I am behind already so I'm not sure where to begin let alone how to get to the answer so I'll really appreciate any type of help to get started..thanks 1)A spring with a spring constant k = 50N/m has an unstretched...

hey everyone, i have a few questions that i just don't understand. 1) a golfer imparts a speed of 27.0m/s to a ball, it travels the max possible distance b4 landing on the green. the tee and the green are at the same level. a) how much time does the ball spend in the air? b) wat is the longest...

hey everyone, i have a few questions that i just don't understand. 1) a golfer imparts a speed of 27.0m/s to a ball, it travels the max possible distance b4 landing on the green. the tee and the green are at the same level. a) how much time does the ball spend in the air? b) wat is the longest...

What are the best intro to QM books out there? Hopefully we'll use Griffiths for the class next semester, but if I want to have other references, what should they be?

Well it appears nowadays that organic and biological chemistry are inseparable. So here is one suggestion for a start. http://vig.prenhall.com/catalog/academic/product/0,1144,0130418420,00.html John McMurry, Cornell University Mary E. Castellion, Norwalk, Connecticut 1. Matter and...

Besides texts by Charles H Corwin and Stephen Zumdahl, what texts are recommended for Introduction or Fundamentals of Chemistry. My texts are at least a couple of decades old. :biggrin:

Here is a paper on the arxiv, preprint of an encyclopedia entry, which might be useful to many to introduce the ideas and techniques used in perturbative quantization of different fields. If you are content to accept for the moment brief definitions instead of leisurely motivations of the...

Hi you all i am looking for some introductory texts on electrical engineering...you know , how does an opamp work ,and so on ...anyone got some nice online courses ? marlon

hey guys I am sagar from India, just joined, glad to have found such a site, after reading lots of the problems and stuff... i think i can muster some confidence to put up my questions to the geniuses.. neways...i wanted to ask whether anyone knows of any universities offering btech degrees in...

Please help with Griffiths Intro to Electro. Problem 3.41! I'm having much trouble with problem 3.41 in Griffiths intro to Electrodynamics...

What does it mean to say that a n x n orthogonal matrix has n(n-1)/2 independent parameters? And why is this so? Can this be shown using the equation the summation with respect to i of the product aij(aik)= bjk where j,k=1,2,3. And bjk has the property bjk=1 when j=k...

I know that this board will be really good...but I was wondering in terms of something to supplement my textbook... do you guys know any sites w/ explanations and lectures, so I can understand teh topic better?

I am taking an intro to QM course, but it seems way beyond intro. The book starts immediately by discussing concepts that I haven't been introduced to in my previous physics course. I have a number of questions to answer. Of course, I don't expect answers to the problems, as I wouldn't...

I am having dificulty with this homework problem. It doesn't seem to give me enough information. I am asked to find the volume and surface area of an object of unknown volume and shape. Here is the problem: A sculptor builds a model for a statue of a terrapin to replace Testudo (go UMD!)...

I was bored today and thought to kick off the revival of www.quantumninja.com/toe (opening tomorrow again) that I would create this http://www.quantumninja.com/toe/StringIntroLecture.mp3 It is about 35 minutes of a lecture I wrote with help from some members here including...

Ok. This is a fairly simple question since it is problem #11 of Chapter 1! Yet, I cannot do it. (Hopefully this isn't a sign of things to come). Anyway, basically the problem goes like this... A monument rises to a height of 192m. You estimate the line of sight with the top of the arch...

whats a good intro book to tensors and manifolds?

I have found a site that derives Bell's inequality The number of objects which have parameter A but not parameter B plus the number of objects which have parameter B but not parameter C is greater than or equal to the number of objects which have parameter A but not parameter C. And I...