Interesting Definition and 745 Threads

Imagine you are spinning on a top. You naturally go to the edge, correct? Well, I have heard that you do not experience acceleration, but I would think otherwise. Though you are moving relative to the object, and the Force that it applies to you should get anything with a mass of one to...

What is the most interesting astronomical object you have observed through a telescope?

Interesting new concept car-runs on compressed "air" link here : http://www.theaircar.com/ thoughts ?

Come across any interesting graffiti lately ? On the door of a math dept. classroom where Calculus was being taught : 1 + 1 --> 3, for large values of 1 Finger-written on the dusty rear windshield of a car parked near my apartment : I wish I had a woman this dirty

http://starbulletin.com/2004/06/28/news/story6.html How about a Doberman Chihuahua, or a Pekingese Mastiff? another interesting fact: http://en.wikipedia.org/wiki/Dog#Dog_breeds

If the Earth were hollowed enough so that a man could go to the center of it, assuming no magma, and be placed directly in the center of the Earth and assuming he was more or less symmetrical ( I know ... weird but go with me ) would he: A: Float in the center because gravity from all sides...

This is a question I came about while thinking about the nature of matter and energy. According to string theory, the very fundamental building blocks of matter and energy are tiny vibrating strings. I was thinking to myself then: why are these the fundamental building blocks of the Universe...

Hello everyone, for those of you who recall, I posted earlier about having problems with my power supply...well i fixed, and here is how... I recall hearing grinding sounds from my pc, and I figured my power supply was screwed up, so I researched, and found a new power supply in an...

What is the most informative and interesting physics book you have ever read? I'd like something to read that's worth the money!It can be about any subject.Technical or non-technical.

Does anybody know of some really interesting scientific developments that are recent. And if you do, is there a lot of info available on the topic. Thanks :)

A serious problem in our use of planes for transportation is the possibility that they might crash. What if we could stop this? Here is the proposal, from a physics professor at my university. If at the time that a plane lost its ability to stay in the air a rocket was sent from the plane...

interesting overview http://www.science.psu.edu/alert/frontiers/AshtekarHandout2-2004.pdf Pen state lectures feb 2004 Abhay Ashtekar. QUOTE. "there was no emergence of the universe from nothing because nothing simply does not exist". "radiation or matter can transform into geometry...

This is an authentic psychological test. It is a story about a girl. While at the funeral of her mother, she met a man whom she did not know. She thought he was amazing, her dream guy, and she fell in love with him but never asked for his number and could not find him after the funeral. A few...

I'm taking the Putnam next fall, and decided to pick up a copy of Larson's problem solving book for practice. I'm having trouble, though, with one of the problems. It goes as follows. A well known theorem states that for a prime p>2, p=x^2+y^2 iff p is one more than a multiple of 4. Show...

an interesting problem I came along this problem, it is quite interesting. However, I have worked with the problem to long and than you can't see any new ways. So I thought, maybe you guys could try it with a fresh mind. Good luck, it is a tough one (or I fail to see something obvious) imagine...

Here's a pretty difficult integral that our prof threw at us a couple days ago... left the whole class a little dumbfounded. I wish I had symbols to use (such as the ones that a lot of the pros on this site use)... but I'm sure you'll be able to understand. Integrate (from a to b) the...

Can you think of a statement, not necessarily in geometry, which sounds true, appears to be true in some cases, but is actually false.

This message is meant to start a new format of the postings on sci.physics.strings. Everyone is invited to answer the question "What was the most interesting paper on hep-th, hep-ph, or gr-qc today?" My answer for the night of April 4th is the paper by Pioline and Waldron The Automorphic...

I've disagreed with my professor on this point, because I still cannot see how I am wrong. Consider the following equation: If x is an integer, (x^3 + x)/(x^4 - 1) = x/(x^2-1) I'm asked to either prove, or disprove this, and so I arrive at the following (man I wish I knew TEX or...

I'm doing this paper on pi and the question popped up in my mind: why is pi interesting to us? ok, it might be interesting to find new, faster ways to calculate it and stuff like that, but does it have any use, function? what progress are we making? I know it's ralated to the strings in the...

http://members.cox.net/mkdjgr/7126.gif Scroll the page vertically. Pretty cool, don't you think? Do you know any other interesting patterns?

Here's an interesting idea I had today. Not trying to say it's true necessarily, just found it interesting and thought I should post it. It's adapted from an msn conversation (heh), so the style is probably a tad odd. :) We may be destined to live, but if we're stupid and make a choice...

Prove to me mathematically that if I start walking from one end of a room that I will eventually reach the other side. Be sure to include all your formulas!(hint:remember theorems!)

Prove to me mathematically that if I start walking form one end of a room that I will eventually reach the other side. Be sure to include formulas! (hint: use calculus)

This is a simple question that may have a long answer, but here goes. If any of you are chemical engineers, I'd like to know a little bit about your job. What tasks are you normally assigned and what kind of environment do you work in? I appreciate any and all feedback! -Muon12 (the guy...

I wrote an interesting paper, and I require feedback. Could you please check it over. Thanks in advance. -------------- 20 joules equals 20 joules, right? Well, consider the following: "Ball A" work done = 20 joules force = 10 Newtons mass = 10 kg acceleration = 1...

Hello everybody. Making a search about magnetic propulsion systems using relativity speeds (and then time delays on fields), i found this VERY VERY INTERESTING internet page: http://members.dancris.com/~bfraser/4v4a/ADVPROP.html I recommend to read it as you would read "history of time"...

Another "Interesting..." This link shows who contributes to which party by county: http://www.fundrace.org/moneymap.php?cand=RepVDem&zoom=County

Bear with me, the info is from cnn.com, but i found what it had to say interesting...perhaps living nearly 100 years ago wasn't so bad? http://money.cnn.com/2003/10/02/pf/taxes/irs_birthday/index.htm?cnn=yes at this rate, in another 100 years the United States government will have the tax...

recent post at spr by Jeffery Winkler contributed to the debate between the anthropic and mis-anthropic camps within Stringery ----------------------- Jeffery cites an earlier exchange between Thomas Larsson and Lubos Motl. Larsson wrote, 22 Sept: [[Now I am starting to worry seriously...

http://story.news.yahoo.com/news?tmpl=story&cid=68&ncid=68&e=1&u=/nyt/20030915/ts_nyt/chinasendsarmedforcestomonitornorthkoreanborder This article reports that China has moved 150,000 troops to the North Korean border. Thats as many troops as the U.S. has stationed in Iraq.

Aoccdrnig to rscheearch at an Elingsh uinervtisy, it deosn't mttaer in what oredr the ltteers in a wrod are. The olny iprmoatnt tihng is taht frist and lsat ltteer are at the rghit pclae. The rset can be a toatl mses and you can sitll raed it wouthit porbelm. Tihs is bcuseae we do not raed ervey...

Something Einstein wrote in 1952 contains this quote "Space-time does not claim existence on its own, but only as a structural quality of the field." It is not especially easy to grasp the meaning, I suspect, but it might be worth thinking about. Eh quoted this in another PF thread and I...

I recently read in a book by Deepak Chopra that the human body is actually 99.9999% empty space... Is that true?

FYI. http://www.kolisrael.com/

I find the paper that Andrej Okolow and Jerzy Lewandowski posted at the arxiv in February this year to be fascinating. In case anyone wonders why, here's a recent thread that may help you understand why https://www.physicsforums.com/showthread.php?s=&threadid=4426

This is my second post on this subject. I couldn't get anyone to comment on the theory itself. I found it online and it seems to make sense to me. I can't find any errors in the math or the reasoning. The theory is available at http://members.triton.net/daveb Please comment.

does anyone know where that little dot in the middle of the ocean is, if its around some islands or something my geography skills are terrible thanks

Ok somebody was bound to post a thread on this so what the hell, anybody got any interesting links or insights into this ?

I thought I would try this one out for giggles. We obviously have a very intelligent group of interesting people here. I am wondering if we have a good supply of interesting, surprising, or amazing trivia. Here are a few that surprised the heck out of me. I am told that the most...

I recently ran across an interesting theory online. The author developed a geometric representation of SR that also explains the Dirac matrices as well as many other things. Has anyone else seen this? http://members.triton.net/daveb

This product is designed to absorb CO2 from the environment. I just saw a report on The Science Channel. It seems that this idea has been well received by some scientists. http://www.eco-cement.com/

http://www.geocities.com/bridgestein/Bffield.jpg (copy and paste the above address to your browser please) In fact I know the answers of this problem, but I have a question. Here's the question. A charge +q moving with constant velocity v enters into a uniform magnetic field region as...

Interesting Quantum Mechanics Problem Suppose we have a particle in a box with infinite potential for x>a and x<0 and zero potential in between.Then by solving the schrd. equation we get a node at x= a/2 for first excited state.Which means the probability of finding the particle at x=a/2 is...

interesting inequality involving sums Which is the smallest n-natural number- for this inecuation: &#8721k=2n {1/[k * ln(k)]} &#8805 20 Any ideas?