Request Definition and 182 Threads

I'm going back to basics again in an attempt to add golang to my list of "pretty well learned" languages. What I need to do should have a pretty simple solution: I want to ignore a request to get a result from a channel in golang, if you need to know the particular situation I have a link to my...

Hello all. I was wondering if anyone has any external sources for a list of math textbooks, particularly by the same author, going from arithmetic all the way to differential calculus (or some other harder form of mathematics). The reason I want it to be the same author, is so I can be sure that...

Hello everyone, i need to find reported transfer functions of internal combustion engines for a project, i would appreciate the model of a four cylinder engine. If anyone knows about a book or some article which i can use, please let me know. thank you very much. the topic is related with...

Hello, I am an electrical engineering student and I was hoping some body here could help me out with a cantilever question. I want to model a vibrating cantilever with a mass at the end. I am doing this for a project where I wanted to model a Wurlitzer 200 Electric Piano. The way they produce...

Ehi guys. I noticed that the excercises of my book are quite 'scalar', that is none of them require to use explicitly some vector properties, they're all funny special case. I want something more exciting. Do you have any suggestion? Thank you very much! Bye bye topic: kinematics, dynamic of...

:(as a student, any help would be appreciated.

Hello Moderators, Why there isn't any sub-section dedicated to "Computer Science & Engineering" in Engineering Section. It'll be very helpful for Computer Science students to share their doubts through that sub-section. We some group of CSE students had trouble clearing our doubts. So, we use to...

Hello everyone, I'm a beginner in quantum mechanics and I've been curious to know the textbook of that problem

I'm a 1st year Physics student from the UK that's trying to get informed. After seeing the patent attorney thread, I did a little digging. Not sure how it works in other places, but in the UK you're required to have a degree in science (not a PhD, and as far as I'm aware, there's no requirement...

Hi, I'm looking for a good maths book that emphasises on Physics. I'm doing A Level Maths and Further Maths with other A Levels (17 years old in England, UK). So I've met Differentiation (quotient, chain rule, trig differentiation, implicit...), Integration (by parts, substitution...

I've indicated two rectangles. Can peeps tell me what they get for the ratio of widths? And then the ratio of lengths? Thanks. rectangles.JPG

What's a good book on split-complex numbers? If it also covers dual numbers or the relation between split-complex numbers and special relativity or Minkowski 4-space or some analysis of split-complex numbers then all the better, but that's just gravy. I really just want a good reference for...

Question:- A block of mass 10 kg moving with a velocity of 1 m/s collides with a spring of force constant 1000 N/m. Calculate the compression of the spring at the moment when kinetic energy of the block is equal to one-fourth of the elastic potential energy of the spring. Attempt:- Step 1...

Explanation of questions for first problem: We are three brothers(X, Y, & Z) and three sisters(A(45 years), B(42years), & C(24years)). Our neighbor are three brothers(K(45 years), L(35years), M(32years)) and five sisters. My three sisters are mentally ill. A became mentally ill when...

Advice request -- design a toy steam engine and do a pull event Hello, Please do forgive me if this is inappropriate use of this sight, I'm looking for general advice, any suggestions as to where I could get information and thoughts on the subject are welcome. I've taken a challenge to...

Hi, Background: I'm a junior self-studying Calculus, and I want to study from a rigorous textbook. I've seen many threads comparing and contrasting the textbooks of Apostol and Spivak. I have access to the online versions of both author's textbooks, but I find it difficult to concentrate...

Homework Statement A baseball with a mass of 0.125 kg is moving horizontally at 32.0 m/s [E], when it is stuck by a bat for 0.00200 seconds. The velocity of the ball just after the collision is 52.0 m/s [W 20 N]. Homework Equations p = m Δv Fnet = ∆p/∆t there are also these...

how do i calculate potential differences around the loops is i3+i4 equal to i5?? this is actually from maths and i completely forgot how to do calculation around electrical circuits from physics could anyone please help me!

The FAQ states: "In our universe, we observe that space is not a vacuum, and tidal forces are nearly zero on cosmological distance scales (because the universe is homogeneous on these scales). " We observe Dark Energy. How do we know this accelerated recession of distant galaxies, which is...

Hey folks! Wow...been a while since I posted here. So this ought to be a simple script I'm running in Command Prompt, but it completely skips the part where it asks the user to enter a number (after asking how much would you like to withdraw (or deposit) ) What gives? <?php...

Can somebody in this forum please review my fanart? Medium: Microsoft Paint Fanart Subject: Valkyria Chronicles Fanart #1: Corporal Isara Gunther http://imageshack.us/a/img15/2049/xrhv.png Fanart #2: Edelweiss http://imageshack.us/a/img845/6687/edelweiss.jpg

I've been selected for my company's leadership program. I have a one-on-one coaching session today. I think I've gotten the first time slot out of the 25 people in the program (world wide). We're encouraged to talk about our goals and our recent "round 2" in-depth MBTI results. What are some...

I am wondering to published a journal on DC had drive generator. Could someone please me which should be my topic?

Having taken many years to write a huge tome, I'm surprised and very pleased to find this section of the forum. I have already asked about the math involved in accelerating a huge vessel in space, but was acutely aware of typical forum rules about self-promotion. I really would like some...

Am I correct in thinking it is currently believed that a single photon at rest has no mass a single photon in motion does have mass ?

Hello guys. Am Derek, a student doing B.SCI in mechanical Engineering at Makerere University in Uganda currently having 2nd year industrial training. my main reason is to kindly ask for your opinions guys about which field of mechanical eng i should follow.I seem not to understand the best way...

Hi, I'm hoping to achieve some intuition regarding the real and imaginary parts of the complex conductivity. The rule of thumb seems to be that the real part is due to the absorptive/dissipative processes and the imaginary part absorbs no work (over a time average). However, I feel like...

I'm an author and I want to correctly portray a scene (with a bit of artistic license) in my next book. However, I don't think I understand the physics of the situation. Scenario: Passengers flying in a G6 going 450mph at 35,000 feet. Jet goes into a nosedive at let's say a 45 degree angle...

So I was 3rd author of a paper published by our group. I then applied for a fellowship which requested me to describe my research activities. I cited the paper I had my name on. My advisor reviewed the application and told me to put my name first on the fellowship application. She even wrote...

I am looking for some input on the proper use of the definition of the Schwarzschild radius. Case 1: In the world of black holes, the Schwarzschild radius is used in reference to the distance from the center of a mass dense enough to not allow light to exit. It is a short distance compared to...

Please use this thread if you don't see the math textbook you are looking for. In your post please include Title (edition) and author. We'll do our best to add it quickly. Once we add your listings we will delete your request post. Thanks! Of course, we would appreciate your participation...

Please use this thread if you don't see the physics/astronomy textbook you are looking for. In your post please include Title (edition) and author. We'll do our best to add it quickly. Once we add your listings we will delete your request post. Thanks! Of course, we would appreciate your...

So I would like to learn more about PDEs. Background I have only one course in PDEs (intro obviously) and we covered the big three equations: Heat, Wave, and Laplace (Cartesian and Polar). Sturm-Louville, d'Alembert Solutions, Method of Characteristic lines (with nonvarying coeffiicents)...

Dear Friends, Would you please provide me with some hints to find the analytical solution of the non-linear PDE given below: U=U(z,t) Uzz-(A/U)*Uz=Ut BC's and IC's are: U(z,0)=B U(1,t)=B Uz(0,t)=A*H(t); "H" is the heaviside function and H(0)=0 where A, B, and C are constant...

I don't know if this is the right forum. Please move it to a better suited one if it exists. Basic info: I am a sophomore taking Modern Physics and will be having my first exam this thursday. I've solved a healthy amount of problems already, but I wouldn't mind being as prepared as possible...

Yep, we're closing in on another Presidential election here in the States! Tell-tale signs include PFers who are sweet and rational most of the time are now bitter and frustrated. Members can be seen storming out of P&WA, angry and with bruised feelings. So...everyone take a deep breath...

Homework Statement http://img507.imageshack.us/img507/6493/f7868b61c6cb4d6084fa5ba.png Homework Equations The Attempt at a Solution I've tried to deduct how my textbook has actually done this Thevenin Equivalent. No one in my class (that I've come into contact with anyway)...

I need a mechanical device modeled in Autodesk Inventor, but I just started teaching myself the program about a week ago, and I can see it's going to take a long time to become proficient at it. I'm an artist, not an engineer. So I'm looking for a mechanical engineer that is skilled with this...

I had this elaborate example all set up to lay my question out. and I can hear my x wife in my head. "you over think everything" So here is my question. I do not understand free falls 93feet/sec /second. this sounds to me that Tim would be doing 279 feet per second after only 3 seconds...

I am working on a forced vib project involving a musical instruments I am trying to have the vibration of my classical acoustic guitar increase, however NO ELECTRICITY CAN BE INVOLVED, and also trying to make the vibration of a piece of tightly folded aluminum that is attached to my guitar to...

Before going off to college, I'd really like to do some physics-related research at a local university. I'm really excited about the idea of physics, and I can do math very proficiently. The problem is, I have no prior experience in research other than labs done in high school science classes...

Hello everyone! I want to do a small project, and would like your thoughts: I'm going to build a small genset, with a target power output of 3kW, and "one person carry" possibility. Using liquid fuel, probably gasoline. Although if diesel is a possibility, that would be interesting to...

Homework Statement http://img806.imageshack.us/img806/9455/67043570.jpg The Attempt at a Solution http://img443.imageshack.us/img443/2449/50431877.jpg The part I got confused at was during the substitution. I understand that there is a bound change (1,9) because we just sub in...

While reading an older article by Schrodinger on Causality a question occurred to me about the nature of energy/time characteristics of light emitted by electron orbital decay. I have been thinking for some time on the relationship/contrasts between generation of lower frequency (ie radio)...

I'm currently an autodidactic mathematician/physicist and before I dive into my rusty calculus textbook to review I first want to be sure that I've filled in any holes in my algebra skills. I don't want to waste my time digging through entire algebra textbooks when I already understand the...

As part of a research project on Dam Safety I am making some calculations for wave runup an wind setup on a existing embankment dam. Looking for information, I found a citation of the US Army Corps of Engineers related to my research topic, but I have not been able to find this document on the...

Standard treatments (e.g., Rindler) of the foundations of Special Relativity invoke use of a "rigid rod" or "rigid scale" by an observer to construct his inertial frame -- by (somewhat fictionally) transporting the rod (and also cloning copies of a standard clock at every point in the frame)...

Greetings friends, I have a new idea for desalinating water but I am not good at physics. My idea may sound stupid and if so I am sorry for that in advance but please could you have a look. I am attaching the image to this post which will try to explain the simple idea to generate pressure for...

With the study of logic, lots of words get thrown around that I don't really understand their complete meaning. With a deductive argument the conclusion is true if the premises are true, and an argument is valid if all the inferences (and the conclusion) follow logically from the axioms. These...

Hi all, I would like to make a 555 timer circuit that when 12v is applied to the circuit an LED will light for 3 - 5 seconds and then go out. and remain out until the 12v is removed and reapplied. Any help greatly appreciated. Thanks