Natural Science Forum / Physics / General Physics / August 2007

1. SR assumes that time is what the clock measures. This assumption leads to
time dilation and at the same time it assumes that a clock second is a
universal constant interval of time. Also this assumption leads to the
conclusion that the speed of light as defined by a clock second ...

What is the highest radio frequency used for astronomy?
According to the link below, it is 3438 GHz:
http://books.nap.edu/openbook.php?record_id=11719&page=11
Is 3438 GHz the highest radio frequency used for astronomy?

Can someone please give me a basic (working) , non mathematical,
definition for radiance and irradiance? I have been using Wiki/Google
but it is difficult for me to tell when to use one term and when to
use the other. I need this for an artistic graphical application not

Before this month. I thought that General Covariance is
the General Relativity Theory version of Lorentz Invariance
where the relativity principle in Special Relativity is extended
to accelerated motion. But I found out it was not. So what

if we [somehow] drop Jupiter into sun , will we be fueling it [adding few
year to his life] or consuming [reducing his life]?

Hi, posted link to online video of Brixham cliff experiment as it happened
in 1995. Hoping for some questions and comments and please don't forget to
rate my video and add a comment on Metacafe J
Andrew K Fletcher

Symmetric and Antisymmetric Tensors relate both to Generalized
Alternating-Sign Matrices and other properties of Probable Causation/
Influence (PI), while Dirac Mass relates to "PI-Maximum Entropy", and

Crueltyfree: Counting photons without killing them
  http://www.sciencenews.org/articles/20070825/fob6.asp
  Davide Castelvecchi
  Disclaimer: No particles were harmed in the making of this

I've been doing some reading on visual perception and
complied a graph of frequencies & found some pretty
decent sines along the way. I was looking into wave
energy of percieved sound and sight, along the lines

Why can the gravity force (allegedly) not incorporated into atomic world.
Where's the problem?

Google Trends shows that Australia has the most idiots, and that there was
an "idiot bloom" in late 2004
Why not Chicago??
http://www.google.com/trends?q=idiot&ctab=0&geo=all&date=all&sort=0

What if human beings had both ways and means to travel interstellar-
ly,
and on finding a reasonably habitable planet out there, chose to
settle

Well, it turns out that the journal submission/resubmission process is an
iterative one, and I was foolish to assume that an initial rejection was a
permanent one.  Now I know what I should have put into the the cover letter
that I ignored, because it looked like a formailty - ...

"The Paradox of Zeno"
    The Paradox of Zeno is 2000 years old and its apparent ability to prove
that all motion is impossible was not resolved until the mathematical
techniques of Calculus became available, even though that technique is not

Look what I've found at the NASA site
http://ssd.jpl.nasa.gov/?constants#ref
"
gravitational constant    G = 6.67259 (± 0.00030) x 10^-11