Natural Science Forum / Physics / General Physics / October 2007

Unravelling the mysteries of coiling ropes
  http://physicsworld.com/cws/article/news/31564;jsessionid=F2B86CF9053C797422EE96
4D036D7FBB
  If you carefully lower a rope onto the floor it will probably form a
  neat coil. While most people wouldn't give this a second thought, an

The concept of Energy has been applied to graphs for quite a while,
and a paper by Dragos Cvetkovic and Jason Grout (Grant?), "Graphs with
extremal energy should have a small number of distinct eigenvalues,"
arXiv: 0710.5664 v1 [math.CO] 30 )ct 2007, 17 pages, U. Belgrade

Probable Causation/Influence (PI) regards Non-Markovian scenarios as
more Causal than Markovian ones because Markovian ones originate from
one-step-at-a-time ("memoryless" or "one-step-behind memory") Markov

Why exclude the symbolism of art making when
it is personal variation of mathematics, and does
this very human of activities from our earliest records
(Lascaux, France), really diifer from our perception

I'm stuck on a problem involving the Lagrangian formulation of
classical mechanics. Here is the problem and what I've done so far;
help is greatly appreciated.
(Problem: A wedge of mass M and angle [alpha] slides freely on a

Can somebody clarify this for me?
if two spacecrafts approach at the speed of v=0.8c and w=0.8c, the
lorenz transformation gives their relative approach speed by u= (v+w)/
(1+vw/c²) = about 0.975c. ok fine, I understand it can not be more

Hi All.  Check out:
http://www.pacificsites.com/~snyder/Motor/high_efficiency_power_conversion.htm
Any suggestions or comments would be appreciated. I live in northern
california if someone would like to work with me.

So Friday, I pretty much finished up a batch water heater for a friend
that lives off the grid. Here is a front and back of the box:
http://lakeweb.com/boiler/BH_alum.jpg
http://lakeweb.com/boiler/BH_back.jpg

As well as a hadron is divided into quarks, is a lepton divisible into
more fundamental particles? Based on that idea, I tried to introduce a
composite model of lepton in the following site;
http://hecoaustralia.fortunecity.com/lepton/lepton.htm

http://www.imagebam.com/image/6bbe8c625707
What would the population of the universe be, if mankind left the
earth, and the current population curve continued? Anyone know?
http://en.wikipedia.org/wiki/Image:Population_curve.svg

Greetings Gents.
Given 25mg of aluminum heated via tungsten wire in a room temperature
vacuum chamber operating at 2x10-5 torr, what velocity would the
resulting Aluminum vapor atom have has it traveled thru the chamber on

I read somewhere, nuclie collide with each other to produce nuclear
reaction the same way as chemical reaction occurs.
Chemical Reaction
H+H -> H2

Here's a tip for my faithful readership in sci.physics.
The best way to get information and news.
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INSTRUCTIONS:  Each of the following multiple choice questions has
only one correct, or more nearly correct answer.  There is no time
limit for the quiz, so answer each question in the order written.  The
correct answers are printed at the end, but please, no cheating!  Each

Einstine said we can convert mass into energy. and gave equation
E=mc^2.
Say we take 1 Kg of Mass.
Say 1 Liter Water. The Total energy we can get through it is.