What is Hello: Definition and 271 Discussions

Hello and a question about our universe... Hello. I'm new to this forum, and I've been reading lots of interesting stuff in this forum, especially under this Cosmology Heading, which is where my main interest lies. On another thread Janus said, "The observable universe is just that part of...

Hello everyone! Help me please with osciloscope manual. We have been translating electrical characteristics, and there is a couple of questions. mArms (what is it milli Amperes root-mean-square?) System aberratoins 10% p-p (is it peak-to-peak?) What is a front end of oscilloscope? Is...

Hi there everyone, This is my first post here. I'm a musical instrument maker who also dabbles in robotics and electronics as a hobby. I need some help identifying a mechanical component. It's in two parts, a plastic internally threaded housing and an externally threaded insert that screws...

Hello everyone! Need help with choosing a term. The situation is that there is a molding process. The result of this process is a cylindrically shaped part made of a mixture of graphyte and and composite resin. When the mixture is put into the mold, the mold is closed and held in this...

Well first of all, let me say that seeing “2012” as “Post Dates” on the forum still seems a little weird to me. Now, are any of you going to miss 2011? I personally know that 2011 was the worst year academically of my entire life. This is no exaggeration either, it was literally horrible. It...

I haven't seen this posted her yet so... http://money.cnn.com/2011/12/29/technology/verizon_convenience_fee/

Hello everyone, i am new in this forum , me very glad to see all the members of this forum , so please welcome em guys, thanks...

Well, I have become interested in physics and its relationship to philosophy and the mystery of the human conscienceness. I am 17 years old and love to learn new things for myself. I am becoming quite the self-educator lately and I am beginning to learn more about math and science than I ever...

I am a Skeptic among other things and saw that their was a topic called "Scepticism & Debunking". I'm into debunking 9/11, 2012 dooms day, documentary films. Decided to post up on here and maybe chat with Skeptics apart of "Scepticism & Debunking" and other people as well. I've recently had...

Hello! I'm new to "PhysicsForums", and thrilled to be part of the community as well. I'm 13 years old, and became interested in the subject of Physics two years ago. My love of Physics was most likely passed on from my father, because he is an amauter physicist, though is going to college...

hey everyone my name is jillian and i just want to say hello to all

I just wanted to say that I'm proud to see PF chugging along, being made better every day by both its staff and its users. I hope you're all well. :approve: - Warren

Hello, can anyone tell me how I can show that this diverges \int_{-1}^0\frac{e^x}{x+1}dx I'm out of ideas

"Hello World" Java issue! I've been following Stanford's on line lecture series Programming Methodology and have run into an issue while trying my first Hello World program. I'm using the Eclipse editor and have attached the acm JAR library. When I try to run the file, I get an error that...

hello everyone!glad to here!:smile:

hello to all, im new here, I am just searching someone can mayb help me with my big sitution, i have a closet size: height: 1.47m, width: 75cm, depth: 58cm. there is a very hot MH light bulb 400W, with bellows and vents. and my temperture is around 32-36C! i looking for way too cool down...

hello, a simple question: a circuit with a DC source and a capacitor (assume no voltage loses due to the cables etc..) there wille be nog energy loses during the charging of it, because there's no conduction in the whole circuit, so no work is done by de DC source now assume a AC...

Hello, I'm new to this forum, I'm not really sure if this is the correct board to post it on. But I've got a question, I believe regarding exponents and percentages. The problem I've got is that I have a number of 250 different items, and I wanted to know what the odds of randomly selecting...

Hello, I'm not new to this forum but this is my first introduction. I've browsing through the forum for about 3 years when my friend first introduced me to this site. I hope to contribute to this great community because I've gained a lot of knowledge through this site and hope to pass my...

I don't know what is this forum, but I want to find a good american forum to improve my english and share with friends come from USA ! I come from the Est of France, I've got 3 children, I don't work, staying at home to take care of my children and my home. What about you ?

hello From wiki.. ''There are a fixed number of orthogonal codes, timeslots or frequency bands that can be allocated for CDM (Sync CDMA), TDMA, and FDMA systems, which remain underutilized (to fail to utilize fully) due to the bursty nature of telephony and packetized data transmissions...

Hello PF. I would like to get your view on the plausible scenario panspermia that might have happened from Mars to Earth. I will try to explain what I know about this scenario and please correct me if I am wrong but I am quite fascinated and a little bit disturbed that this might be the case...

hello intelligent people I need a little help 8 liter of air volume, ambient temp, then compressed at 8.2 bar = volume in cu cm? thank you for your help...metric or US... volume would be 2.11 gl @ 120 psi keep it simple please stef

Hello how are you all i am new in physics forum Whats up

Hello! could you help me with this? I´m from biology field and have some difficulties with the following calculation: I want to estimate how much mor UV is coming from a mercury short arc lamp of a fluorescence microscop compared with the sun UV, so that I use the right eye protection for...

Hello friends, I have this problem I'm having difficulty with, it reads - simplify the following expression ( ( x + 2 ) / (x^(2) - 2x) ) - ( (x) / (x^(2) - 4) ) it wants me to simplify it into ( 4(x + 1) ) / ( x(x - 2) ( x + 2) ) I can't get it to...

hello! I'm new over here.. Hope I'm writing where it should be written. What is the solution of x=tangent(x) ? Well.. in fact I'm looking for the point where the graphs of function tangent and its inverse, arctangent, intersect each other (if we plot them on the same...

Hello guys, I'm working on a machine now and it's called DFIG (Doubly-fed Induction Generator). It is connected to a power converter on the rotor only. My question is: how are you able in supersynchronous state to have a induction on the rotor. I know that you have an excitation current...

ok, and object is hanging on two strings. The object weights 20 kg and the angle of the two strings are different, one of them is 60 and the other one is 70. There are no other forces in it. I need to figure out the tension of each string. Please help me

Just felt like making my own welcoming thread, even if it comes a bit too late..:smile:

Hello everybody, after hanging around anonymously for ages, I've decided to register myself. It's easier to reply on topics that way. But I've seemed to catch your attention, so i'll tell something about myself. I'm a guy from the Netherlands (are there more dutchies out here btw?). So...

Hello to everyone! I've just signed up after finding your site whilst trawling google for some answers. My name is Steve, and I'm from Leicester, England. I am 27 Years old, and very interested in some of the discussions going on here (and I hope to participate in some of them without...

I'm glad to join this community. I'm currently a high school upperclassmen interested heavily in science, primarily in biochemistry. I take advanced (IB) courses in Biology and Chemistry and plan to Higher Level in them, and then also take SL Physics at the same time, and Calculus AB SL...

Hello everyone, my name's Ricky (or RJ, whichever you prefer). My interest in physics (and, incidentally, logic and philosophy) started when I was watching Star Trek on my tiny black and white television as a child. Around the time I was eight or ten years old I got interested in astrophysics...

I just wanted to greet my self. I am 15 and am into coding as well as engineering. Some projects i completed are Fume Extractors, Transformer Shocker, Joule Thief, and other stuff. I have basic engineering tools like soldering irons and stuff. Got interested after watching Iron Man. So yea...

Hello everyone, first time post here. Before the question, a brief background: Intro: My name is Brian and I am a flight instructor with a BS in aviation flight operations. I enjoy science in general and study it on my own time for fun. That said, my science background is still meager so be...

Hello everybody this is Clarke new to the forum , hope u all welcome me :)

Hello forumites! I got another question (I have a lots of them, maybe I should change my textbook haha). Suppose you have a continuous real-valued function f on the metric space X and a closed set E in X. Is f(E) closed in the reals? By definition, I know that if f(A) is closed, so is the...

Hello Guys, It would be really great if anyone can explain me what does mode of vibration exactly mean?? What does 1st,2nd ,3rd and 4th mode of vibration at 3Hz, 15Hz ,20 Hz and 40 Hz mean to the system.? Please check my knowledge on order of vibration too.. Order of vibration:-If a...

Hello all, what is meant by Rieske..[i quite often read in Rieske dioxygenase, sometimes in bioinorganic chemistry.] Please explain me in brief. (1 or 2 lines). thanks

Hello Guys, I want to know what is the criteria to enter MIT(Massachusetts Institute of Technology) What are the courses offered here?

Hello.. Can someone tell me what sources in the Universe produce anti-matter? Do black-holes, stars? stellar explosions? I can assume if these things are large in number...there should be a lot of anti-matter floating around in the Universe. I know a lot of it gets destroyed in the...

Hi I just joined a little bit ago, I am an avid member of scienceforums.net. I decided to expand my forum community, and considering that physics is one of my favourite scientific topics I am looking forward to a positive experience on this forum. Is anyone on sfn? Other than that not much to say!

Hello again everyone. I am chaoseverlasting, for some reason my account got disabled. Is it the name length?

Hello all. I am Vincit, a new member to the Physics Forums. I'm 15, and i got into the 'game' when i was quite young. I started learning Newton's Laws when i was 9 years old. I also started doing complex experiments such as creating haemoglobin molecules with stick magnets and metal balls...

At least that is what I am told when I ask it around here... How long would it take to go get to 45 miles per second at human tolerable acceleration? I am not a math whiz obviously, but I have some questions that get me some really strange looks, and no answers. I know that currently...

Hi, my name is Josh Would an actual engineer answer the following questions? What do you do in your job? What do you like about your job? What are the cousrses and reqiurements for your job? What was on project you really liked? Do you need more people in your field of...

Hy, i am back with my annoying questions about this and that. Could everyone tell me why the frigging dipole have an electric field that drops with 1/r^3? i mean, if i am far away , i should feel no electric field, you know, q2 = -q1 , so they cancel, but i feel (q1 q2 k)/r^3.What the HECK?

Express as the product of disjoint cycles: a. (1,2,3)(4,5)(1,6,7,8,9)(1,5) b. (1,2)(1,2,3)(1,2) I now how to do in 2 row permutations, with right to - left. can anyone tell me , how to express it without transfer it into 2 row permutations. One more question, How do we find out it's...

Hello people, this is my 1st time posting in the forum and its very nice. Well the thing is that i don't know what career to choose, I would like to be a engineer or something that have to do with science. I like Isaac Asimov Sci Fi (Sci Fi in general) , love thinking about future of science...