Welcome Definition and 154 Threads

I am 30 years old and I thought to refresh my math knowledge. I am glad to be part of this forum, seems very active! Regards

Hello people, how are you? I am a 20 years old student from Brazil. I study Electrical Engineering at USP - Universidade de São Paulo(São Paulo University). My favorite scientific topics are Mathematics(Polemic: is Math a science?), Electrical Circuits and Physics, and not some that are not...

Hi everyone, I'm currently researching graduate schools in mathematics. I would like to go for a PhD. My question is, do I apply directly to the PhD program? Or do I apply to the Master's program and apply for the PhD afterwards? What do people normally do?

http://www.stuff.co.nz/life-style/parenting/68221125/royal-baby-the-first-glimpse-of-kate-and-prince-williams-baby http://www.beehive.govt.nz/release/prime-minister-welcomes-royal-baby-0

Welcome. I spent a lot of time on PF last semester when Googling for similar problems to homework I had trouble with. This site helped me a lot back then. Now, I'm finally registering (I don't know why it took me this long.) I am a BS Physics major. I hope to learn a lot here. Thanks for being...

This is my "Hello Thread". Hi scientists, I hope we could work and help us each other. Happy new year! See you soon...

Hi I'm about to start my 3rd year in my Engineering university and would like some ideas for my Final Year project... We have 2 options. We can either make a model/prototype of something and present it OR we can do a research on a particular field. I'm leaning more towards the research side...

Hi there I am new to this site but I have been reading on it for a while. I have a question, I am building a loading ramp for my box truck to load my lawn mower in. it will be about 12 feet long and 6 feet wide I was wandering what size steel box tubing would be best used for this the...

Howdy y'all, I posted a ways back about an interest in science policy, concerning internships. Now I'm more or less asking about possible classes to take. I am in the process of a political science minor and I need a few classes to take and I'd prefer them to be useful or interesting. If...

HI! i am new to this PF, discovered this site few days ago. After seeing the brilliant people here i decided to join. I know very little math/physics(i'm 16) so i thought that if i am in good company at least i'd improve with time.(i hope)

Hi, I was thinking of something: How are one supposed to calculate the moment needed for a scoop to scoop up a sample of e.g. sand? Does the classical p=mv work? Any ideas or comments?

Hi, I'm new to this forum. I came here because I was told by a friend that the forums are great for getting help on classwork/homework. Aside from that, I came here to learn more about science. I always thought that science was about experiments and wearing white lab coats and growing long...

Hello. I have a question regarding the p-n junction. When I look at figure B here: http://en.wikipedia.org/wiki/P-n_junction it looks completely wrong to me. Take the E-field. It is going to be positive outside the depletion region, which in turn will make the voltage tend towards zero...

Hi PF members! I've recently been working on an image (see attached thumbnail) in which I try to include the most important/influential steps in the history of science. Now, I am very well aware that this is not easy (!) :smile:, and it will always be debatable and not without controversy...

Greetings to all, I know activity for a Am-Be neutron source. I want to compute strenght source in neutrons/s. Yours advices are welcome. Thank you!

HI : good to see you everybody ,I am a new comer on this board Being a math teacher ,I always trained my students with various difficult problems from now on I am going to post a sequential challenging questions for people to share most of them I know the answer and the solution of it , maybe...

Hello! I'm a third year student studying physics. My spring semester has begun and I believe I'll be frequenting this site more often. I suspect the classes that'll give me the most trouble are quantum, EM and solid state. I hope this can be the place to get assistance along with helping...

Criticism of small "bridge" design welcome. I live near a park that has two large hiking areas divided by a stream. If those areas were linked by a bridge the number of possible hikes that could be taken would be increased. The stream at one "crossing" is about 30 feet wide and normally has a...

Hi all! BLUF: I'm starting school rather late (I'm 25) and I'm very interested in Physics and Computer Science. Logically, CS seems like a better fit for me due to my hobbies, but my heart is set on Physics. BACKGROUND: I'm just now starting school at 25 after being in the Air Force for...

Hello Physics Lovers, I was working and suddenly got this question. What external forces have effects on electron spin, like slowing down/speeding up? Is that a possible thing in the first place?

How man of you preread for a math class? All members welcome, mods, homework helpers etc... Talking specifically about math classes. What if an instructor doesn't give the sections to read. When I do preread, it helps a lot to focus in class and gain more from lecture. Almost always otherwise I...

Hi folks, I am new to the group. I was willing to know what is the importance of polarization and also wave number? What idea does angular wave number and general wave number provides? Hope to hear from you guys,soon. Thanks in advance.

I'm Sammy I've been lurking through the physics forums for a while and finally decided to start posting. I enjoy the good advice and humor I've seen throughout the forums. I'm glad to see that there's a forum community just for our kind of crazy. :P

It seems to be project time. This used to be my little front yard: So it was decided to redo it after Myrthe's birth. This was taken yesterday: https://dl.dropbox.com/u/22026080/project1.jpg and this at lunch time today. Dinand wants to help too...

Here are a couple of pictures of a gate at the back of my house. The previous owner didn't paint it. When I bought the house, I should have done so, but I didn't and over the years, it deteriorated. It no longer swings right and the stationary part is falling off.

Congressmen, Why have you allowed such a massive budget deficit to persist? I can only see three outcomes for such a course: 1) Unprecedented budget cuts. 2) Unprecedented tax increases. 3) If neither above, the destruction of the value of the dollar as an international currency. So what...

Hello all, I am a mechanical engineering major who is fascinated with control theory. At my school you can specialize in controls as either a mechanical major, or an electrical major. Does anyone know if being a mechanical major is a disadvantage at becoming a control system engineer? My...

How to fairly divide the contingent payout of \$25,000 (sum insured/face value) as part of total insurance payout \$35,913.33 (balance was from dividends and bonuses)? 1. A paid 8 yearly premium @\$348.25/year (total=\$2,786) inclusive for a relative C(the life insured person). 2. A's...

Hello everyone, I would like to ask you question related to PWR 1000MWe, in the event of Station Black Out SBO there is a safety system called TD AFW to supply steam generator with enough water so that can remove the heat from the primary side indirect way as a heat sink. My question...

Welcome our new tigons! Just before last Christmas, a lioness gave birth to 3 tigons, her off-spring after an affair with a tiger male. The tigon is much rarer than the liger, less than 10 tigons are believed to exist. But, they are mighty cute! :smile:

[FONT="Georgia"][SIZE="2"] Hi to everyone :-) I'm new to this forum. I'm an engineer working in a core field. I need to design brush less dc motor of 30 W power, Inout voltage-13.5 V. I'm struck in winding design . Could anyone help?

(A long drawn out introduction) I thought id post a hello since I've been reading this forum for some months with little or no post activity, it's a very intimidating place to post if you haven't a clue :D. Im Martin from South wales (uk) a 24 yr old Carpenter by trade (5 yrs) having been to...

In the nowadays posh Oslo suburbia of "Bærums Verk" (where there previosly was a an iron works plant, founded in 1610), a moose family, on the third year in a row, has become a welcome sight. This article has a few photos of them...

Welcome to the world of Handwriting technology, where we work on the science of handwriting. At Annant Institute of calligraphy Right we Analyze repair, add speed and style to handwriting.We analyze handwriting for children, individuals & corporate, & we expertise in professional Calligraphy and...

These pictures are incredible. http://www.wellcomeimageawards.org

hello I am a new member in this forum , and I want to learn well with you...sorry I speak little English,so I use google traductor , i speak french , but with french unfortunately there is a little information! now what is a cavity resonant ? and how to write equations for field within...i...

I'm looking to build a new computer for myself but it's been a while since I've done so and I find the market to be more confusing now than ever. Are requests for such advice welcome on these forums? I figure a question on forum protocol would be more welcome than a blatant violation of...

hey guys, We have a design project where we are supposed to design something cool to machine and later auction it off. My group has already come up with a plan to build a small stirling engine. I've been thinking if there could be anything we can add on to it, like a useful/fun addon...

Hi Everyone! I'm new here and like this forum. Can anyone tell me how the electron moving roundly in atom doesn't emit EM waves while changing it's speed?

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

[SIZE="1"]Postcard club members have already seen it (or they will see it once they finally make that trip to their mailbox).

Tonight's episode of Naked Science on the National Geographic Channel.

Hi all Can someone tell me what is meant by an "MC Vertex"? I'm coming across it in some analysis code. Thanks.

Simple yet challenging calc problem - please help! http://img252.imageshack.us/i/en8t.jpg/ a searchlight is located at point A 40 feet from a wall. The searchlight revolves counterclockwise at a rate of π/30 radians per second. At any point B on the wall, the strength of the light L, is...

Hi all I read in a book that coherent means when two waves are monochromatic and have a definite phase relationship. What is meant by a definite phase relationship?

Hello, I am new :) Hello, I'm Rohan I am 13 years of age and think it's time to start a physic's career much to my utter disgust since there's not much opportunity for me since I'm from Australia :rolleyes:. I have had a long thought and decided that i think physic's is a good career for me...

Welcome to the game of doors! Anchor: Alright then, you have three doors in front of you, A, B, C. Two of these three contain nothing, one contains the proof of the unified theory yet unknown to man :biggrin:. You can choose anyone door, which one do you choose? You: Uhmmm.. I think I'll go...

Hi everyone, I'm a new member. Just joined tonight, actually. I'm new to physics & cosmology. I'm here to learn as much as I can because it all feels natural to me. Hopefully some of you can better help me understand the basics and help me learn all I need to know. :blushing:

welcome all I'd like to know if there is a way to calculate how manny photons are in this universe. We can calculate the mass of the universe so is there a way to claculate the number of photons? I also would like to clear some things i don't understand. I read that if people build a ship...

So the deal was a new kitty after the move from the 14th floor back to ground level. I guess my daughter found her, It's the one in the center here having obviously the most interest in the environment at three weeks of age, unlike her black brothers to the right. Her name may become Pebbles...