Mystery Definition and 872 Threads

Does anyone know why there is 360 degrees in a circle? Why not 100 for simplicity sake?

will someone who has google Earth please go to 1 deg 55'24.90"N 157 deg 21'52.47"W at an altitude around 100 miles Do you see an underwater mountain the exact same size and shape as the island next to it? the two foot print shapes could be where god stood when he created the earth, but...

Supposing I started off with a particle, which I know exactly the state it is in, hence, it is in a pure state. And hence also, its entropy is zero. Now, suppose we throw the particle into the black hole and be sucked in, then, then the area of the black hole increases and hence, the entropy of...

This topic could well be in a section related to biology, but more people visit the GD area. So... http://physicsweb.org/articles/news/10/3/8/1

Okay, I need some help yet again. Our teacher is giving us no hints on the "mystery problem" on our test tomorrow. "A boat sends a sonar down to find a submarine underwater. The boat estimates the velocity of sound under the water to be 1500 m/s. Howeer, they are wrong about that velocity...

what is your reading speed?? And if by the way,it is high..what factors are responsible for that.. Have you ever seen anyone having a reading speed of 3000 or more than that...i don't know how that's possible,,doesn't it mean the person has enormous control over his mind..

Does anybody know anything about this guy, Jerry Noble, who wrote this theory at: [url edited out - Zz.] Chris

"Perfect" Tense? Why are Perfect tenses called "Perfect" tenses? Where did they get the "Perfect" from? I require a source, as well.

Ok my thread seems to have gone into a black hole. The existence of such a number would disprove Andrica's conjecture.

Electric Force! I am uncertain how to apply Coulomb's law, if this is even the right way to go about it, to this problem on Electric Force because I am not given two charges. The question is: On average, the electron and proton in a hydrogen atom are separated by a distance of 5.3x10^-11 m...

My Seed Theory? Please help... This is what I came up with on my own and I was wondering if there is already a thought process or theory on this. Singularities formed by black holes are the "seeds" for new universes. The matter needed for new universes is created from the matter...

Ok here is what the problem states in the book "A ladybug settled onto the tip of a clock's minute hand. The minute hand is 12ft long. How far does the ladybug travel from 3:00pm to 3:20pm?" I figured there are 30 degrees to every hour (divide 360 by 12). Then the 20 minutes would...

http://www.gi.alaska.edu/ScienceForum/ASF4/422.html

Cu(en)2 ?? I was wondering what the (en) stood for in [Cu(en)2(H2O)2]2+ I was surfing the web and noticed that it appeared in several articles. Thanks!

From a materials science perspective, what is the point to folded steel? How does the folding process affect the properties of the metal? The place I see this extensively is in Japanese swords, such as Katanas. They will say "hand folded X times" with X usually being anywhere from 150-750, with...

OK this kind of has to do with physics, but more of what happnes when you squash something i suppose. Anyways my dad told me this riddle and when i gave up he said he forgot the answer and it has been bugging me for a while. One thing traveling on a straight path must come to a stop before...

I just ran across this today: http://www.trottermath.net/recurops/kaprekar.html I find this pretty neat, so I just had to post it. take any four digit number w/o repreated digits, and re-order from greatest to least, then subtract it's mirror image number from it and repeat, you will...

It is my understanding that the DNA guys have concluded that all Homo sapiens originated as progeny of a single "Eve" in Central(?) Africa. Since I haven't heard anything about "Adam," I assume that the genetic tracers don't allow anything to be said about the male lineage. Be that as it may...

In 2D for example, warping it only makes sense in a 3D enviorment. In a 2D world, bending 2D would be meaningless. So in GR when we talk about bending 4D ST, is a fifth dimension needed to give ST something to "bend into"? If not, in what sense can we talk about warped ST? I suspect that...

I saw penguins swimming at an aquarium yesterday. They swam deep underwater and they had streams of bubbles escaping from a spot on their backs. My mom thinks that penguins have some sort of a blowhole, but I've never heard of this. What was that?:confused:

I asked why a bomb going off on one side of a mountain would seemingly affect gravity for people on the other side of the mountain about a year ago. Experienced in Nam with valley floors about 2 miles apart. That's a lot of rock and soil seperating those who experienced this from the explosion...

I just saw this show, I know it has been on in europe for a while but it just started here in the US. I was wondering what the equation they were using for the offers from the "banker", anyone figured it out yet? Goooooogle turned up very little.

(t*y'(t))' = t*Dirac(t-2), t>0 we know that y(t) = 1 lim t--> o+ solve for y(t) the solution says that by using f(t)*Dirac_a(t) = f(a) * Dirac_a(t) we get (t*y'(t))' = 2*Dirac(t-2) Dont see how they get that

I consider myself a pretty advanced user of Excel, but this one has me stumped. I don't deal with toolbars very often, so I am in uncharted territory. I have a group of macros. At one time, when I ran one of the macros, I realized I had a circular argument and it created an error. No biggie...

The question goes as follows: Why are clockwise and counterclockwise referred to as "senses" rather than directions? It should be obvious, right? But I just can't seem to figure out what they are talking about. I mean, senses are touch, taste, hearing, seeing, smelling. What does...

This question has been bothering me for time. How does a moving bicycle manage to stay upright? but when it slows down it tends to fall to a side. Can someone please explain?

hi does somebody knows why we hear a noise when tuning a radio? I mean when you turn the radio tuner to find a station. not for a typical station. during turning the knib. I know it's becouse of a electromagnetic wave. but I don't know that wave and its source. tnx.

In free electron theory, electron doesn't feel any potential due to ions r co-electronsm they r totally free..then why don't they fly off from the metal boundaries?

Thanks for any replies in advance. I am currently trying to discern the theory behind an air-lift. A very large group of people are currently debating exactly how an air-lift works. Imagine a pond with a pipe in it. An airstone is place at the bottom end of the pipe and air is pumped...

A few days ago a buddy of mine showed me a two year old article, telling that Israel have developed an optical CPU. I did check i further and it is true, but I can not understand how such a device can work.. Is there anyone who could explain it to me?

Hi, this is going to sound very stupid. Is Re[SIZE="1"]d the same as Re? Its just that in some equations, I have Re[SIZE="1"]d, and then in others Re. It might not sound like much of a problem, but I'd really appreciate if someone could clear things up for me. Thanks!

Why are Bicycle wheels the same size? Is it because it is easier to manufacture and maintain or does having same wheel sizes in the front and back offer added stability when compared to having a bigger wheel at the back (like the early models)?

You can just google it so I won't get in trouble for linking to it. Anyone ever looked at it? It looks like just optical illusion silliness to me but is there any possibility of some other sort of thing going on? Was just wodering if anyone ever did anything meaningful there in the way of...

Hey everyone, I was referred to this forum by CeeAnne, and I'm really hoping I can get some help. I have a series of clues for a murder mystery. There are 8 total clues, and all of them seem to point to different people who commited the crime. I'm stumped at the moment. The author of the clues...

A colleague has just posed this question and I need some help. There is a sealed room in space that has no external infulences. Inside the room is a fridge. The fridge is powered on and its door is open. The question is, what happens to the temperature of the room ?

I'm trying to perform the following integral \pi \int\limits_0^\pi {e^{2x} } \left( {\frac{1}{2} - \frac{1}{2}\cos 2x} \right)dx I split the integral and temporarely ignore the Pi so that I get \frac{1}{2}\int {e^{2x} dx} - \frac{1}{2}\int {e^{2x} \cdot \cos } \left( {2x} \right)dx...

I had little interest in some thing written by Homer 500yrs after the fact, prefering to think the Trojan war a myth, however archealogical evidence is giving some bones to the the myth, i guess we will never know if there was a "wooden horse" or if the characters in Homers story took part in...

Today I received a phone call from one of those automated political telephone campaign recordings. The number was blocked though! That really suprised me. As far as I know businesses of any sort must be listed and can not block their number. I realize that political campaigns, legally...

Hello everyone I'm suppose to find a k, that will make this matrix singular, well i looked up what that ment, and it means i have to make the determinant 0. So i the matrix is: -3 2 1 -9 8 3 (9+k) 2 0 so i found a random minor, say M13.. so i would have -9 8 (9+k) 2 det = (-9)(2) -...

Hello All, Here is an article we have just published on a very interesting development concerning dark matter: http://www.isracast.com/tech_news/061005_tech.htm Comment are most welcome. Iddo

How do we know that a graviton has to be spin 2?

I thought we might try another variation of "What was it?". http://img345.imageshack.us/img345/603/idbadge8il.jpg

Can somebody explain how and why Deja Vu happens?

Hey guys, what is dark matter?what is it made up of and where is it?can any theory explain this? can string theory explain this? so please frendz help me out of this.

http://www.livescience.com/forcesofnature/ap_050906_sisters_bulge.html

I have no idea... A man has three daughters. His friends want to know how many years old the daughters are. The man gives them a hint. HINT #1 The product of their ages is 72. The friends say this is not enough information so the man gives them a second hint. HINT #2 The sum of...

I'm just wondering about something, look at this: \[ \begin{array}{l} \sqrt {3 + x} + \sqrt {2 - x} = 3 \\ \left( {\sqrt {3 + x} } \right)^2 + \left( {\sqrt {2 - x} } \right)^2 = 3^2 \\ 3 + x + 2 - x = 9 \\ 5 = 9 \\ \end{array} \] Obviously something isn't right...

Please help me answer my son's question: It seems as though the outside edge of a spinning CD is moving faster than the middle of a CD. This can't be true, right? Why is it not true mathematically speaking? Thank you. Donna

Why are the bottoms of large clouds flat?

for the past week or so, we've received random calls from quebec. sometimes at midnight. all these calls are are a series of beeps. well, today, I got the same call, except it was from ontario...