Mystery Definition and 897 Threads

Ok, here's the question: A skier starts at the top of a very large frictionless spherical snowball, with a very small initial velocity, and skis straight down the side. At what point does she lose contact with the snowball and fly off at a tangent? That is, at the instant when she loses...

How does a plasma ball work? http://www.iwantoneofthose.com/PLABAL_GADG.htm

Under special conditions, sulfur reacts with anhydrous liquid ammonia to form a binary compound of sulfur and nitrogen. The compound is found to consist of 69.6% S and 30.4% N. Measurements of its molecular mass yield a value of 184.3 g/mol. The compound occasionally detonates on being struck or...

what the !? ok idk if I am right and the book is wrong but help me out the question is... An electron moving at a speed 0.60c collides head on witha positron also moving at 0.60c. Determine the energy and momentum of each photon produced in the process. well this is what I did.. E =...

Hi All Why DNA molecules alone replicates itself were does self property of ( memory ) to replicate comes from ? why not other macro moloecules like proteins ( expect pirons :biggrin: ) don't replicate like DNA :confused:

Fermi Numbers!?? I'm trying to solve this problem and explain all my steps in my reasoning. **HOW MANY HAIRS ARE ON YOUR HEAD?** If anyone can help me figure this out, reply thanking u in advance faiza

I have a smal brain but am trying to help an elderly gentleman (who doesn't speak too good English) with his theories. He talks about a "twon" or tuon in relation to the rapid deceleration of photons, producing eletron-positron pairs. I can't find any particle or process similar to this...

You are in a room with 3 light switches. These switches are connected to 3 separate light bulbs in an ajoining room. Access to the ajoining room is via a door that remains closed, there are no windows, other people etc etc. You are allowed to enter the ajoining room once and then return. At...

Mystery : Myth & History - yet another trivia quiz This is advance warning that I'll put up the actual quiz here in about a day. Also, I'd like to dedicate this quiz to Ivan Seeking and Evo, the irreplaceable Guardians of the PF Lounge. < hope I chose the theme wisely >

here is a part of the protocol we did: a)spin down the chloroplast solution and decant the supernatant. add 4ml water to the pellet. b) add 10ul proteinase K ( concentration= 20mg/ml) to get a final concentration of 50ug/ml. -> how do they get 10ul? which formula do they use? i don't...

Can someone explain how it is possible that the speed of light is constantly 670 million mph irrelevant of relative speed? how is it that you can be going 669 million mph yet light still accelerates toward you at the same rate??

My anti-spam Email account is suppose to be basically spam free. However, today I received an Email which may have contained a virus and a message I could not read. My provider blocked both from my account. The title however was "I cannot forget you!" The Email's domain contained the...

Hi all. Imagine one negative charged dielectric rod into a copper solenoid, and rounded coaxially by another positive charged dielectric. Then we have an E field radially directed passing through the coil. Now put one magnet on top of the coil and another magnet at the bottom of the coil...

I was just messing around and ran across this site that hate math facts on it and I chose a random one about a football field. Here's a http://www.math.hmc.edu/funfacts/ffiles/10010.2.shtml# the fact. Now, I understand what they're trying to get it, but what I don't get is how they came up...

If there is a single atom of water or some substance, can it have the properties of a solid gas or liquid? Or is it a separate state?

Ok i don't know if you ppl know these http://storeforknowledge.com/stores/163/images/lightning%20ball%20large.jpg How do these work?

Another one of the physics teacher working at the college I attended (see my previous post) wrote a book on basic http://universite.deboeck.com/Resources/Titles/28011100266200/Images/28011100266200L.gif . In this book it says that the expansion of the Universe is due to the expansion of space...

ok so I've got this equation M1 = T1^2 M2 __T2^2 the _s are only for spacing purposes can anyone tell me what it is for? I think the M is mass and the T is tension but I really have no idea

Last decade ice core digging in the West Antlantic Ice Sheet (WAIS) gave a big surprise. Diatoms in the mud under the ice sheet revealed that there has been a sea bottom with a maximum age of some 500,000 years but possibly younger. http://www.sciencemag.org/cgi/content/full/281/5373/82...

We have a box in which there are 2 white and 3 blue hats. The light is turned out and 3 boys take at random one hat each and places it on his head. The light is turned on again. Each boy can see the colour of the hat of each of his colleagues but not his own. The first boy is asked the...

The new movie that is about to be released, Exorcist The Beginning (or something like that), got me thinking. The Exorcist is suppose to be based on a true story that happened in 1948, right? And through many tests done by Doctors and Psychiatrists, there was no medical explanation. Is...

Hi! I understand that according to E=mc^2 any normal object can't reach the speed of light because the energy of its motion increases its mass and thus you'd need an infinite amount of energy to reach c. However, it is said that objects with no mass (i.e. photons) travel at the speed of...

why the Universe was at a small point? Is this point like super small like. Plank length Googelplex^googelplex Or just any size smaller then Planck Length? To be undefinable. Why couldn't the universe just all of a sudden be created right where it is, in all the same...

A person is alive, animated, breathing, communicating, thinking, moving. There is brain activity - an energy which can monitored by a machine. Then suddenly their body is a cold lifeless shell and no brain activity can be found. In the terms of physics - what has happened? Where did that...

http://www.newscientist.com/news/news.jsp?id=ns99996151 The explanation will have to wait until next week though when he presents his findings at a black hole conference.

I have heard lightning in the tropics is responsable for creating AC Dc and Neutral fields/currents in the Earth that spread all over the planet. Can anyon confirm this as a theory or fact and if so who formed the theory and when. regards tony

A guy is sitting near the open door with an unhappy face. After some time another guy enters that door. First guy becomes happy and enters the door too. Why??

Why is it that if you actually entered the sun's core,all time would stop,or speed up?

is there yet a mystery about partitions? where can i find some lit. on the subject?

A few days ago my physics teacher told me that to find the magnetic field's direction in a wire you put up your right hand and whichever way your fingures bent was the magnetic field's direction, or at least that is what I understood. When I questioned him why this was the case he told me...

1. What happened in 1961 that will not happen again for over 4000 + years? 2. A man wanted to enter an exclusive club but did not know the password that was required. He waited by the door and listened. A club member knocked on the door and the doorman said, "twelve." The member replied...

Hi, Let's talk about Prime Numbers. Still an unsolved mystery, I don't understand why it's still unsolved. Has anyone discovered why its hard to find a pattern? Or is this a silly question?

Do they really form from fruit going bad... or do they COME To the fruit.. I don't understand how they would form.. from just fruit.. =-/

It is said that most mass in the universe consists of dark matters which don't emmit light. What is the difference between dark matters and planets? Thank u.

http://www.abc.net.au/science/news/stories/s818193.htm

Why does Carbon 12 in dead tissue ''remain'' undisturbed?

I would like to know what sigma is and what it does. What is sigma? What does it stand for? How does it work? Do you have any examples of how it works? any help would be appreciated (im not sure if this should be in the calc section or not)

So what causes this? I was at a clinic the other day, waiting on my girlfriends mom to get out, and was reading a big-muscle-guy magazine. I was looking at the performance enhancers/weight loss formulas/muscle building/etc in there (do any of these really work?), and I noticed ads like this...

gravity must be the most confounding thing to science ,we all know its effects, but no one knows its mechanics, what is the most up to date theory, theories?

Does anyone know the workings behind those little scanners that department stores use...you know, the ones that they can take off and aim at the barcodes on heavy things? I know the barcodes themselves with the thickness of the lines and stuff represent the number that usually appears right...

stars are formed from gas clouds, these gas clouds posses potential energy and kinematic energy, they may also exhibit a density contrast, theory tells us that collapse of the gas cloud starts when PE overcomes KE, but i can find no explanation for the trigger to this collapse ,put another...

Recently in Chemistry we have been doing about how it is possible to identify carbon compounds by how many proton environments there are around a molecule. For this we look at graphs with various peaks dotted around them, this is not what bothers me, what bothers me is that some of these peaks...

This came about on a test today (we have handed it in) and it just got to me. I didn't think it was hard until my teacher made an outrageous claim. Here goes nothin: A hammer strikes a nail, and the nail goes in .8 cm. On the second strike, it will go in .7 cm. It is a geometric sequence...

You know guys, the planets is composed mainly of two types of rock material, Fe-material( siderolites) and the stony element (aerolites), these are heavy elements and available in the apace, which formed planets and stars within 1-2 billion years just because there were two Big Bangs, one...

coral castle mystery... pretty interesting http://www.fortunecity.com/greenfield/bp/16/coralcastle.htm

Dark matter?? What's that?

http://story.news.yahoo.com/news?tmpl=story&cid=573&ncid=757&e=2&u=/nm/20040211/od_nm/fires_dc Hmm, any guesses on what's going on here?

http://www.eurekalert.org/pub_releases/2004-02/cu-aua020304.php

Firstly, just a high to everyone, (first post, aye). Now, everyone has been saying that FTL Travel (Faster than Light) and even the speed of light is impossible. (dammit... ) than how is it that light can go at the speed of light. Now, for some touching back on the SOL theory. As you...

Why is there never thunders during winters? Shoudnt the cold air be even more conductive?