Arguments about the safety of high-energy experiments
sometimes cite the rate of high-energy few-particle collisions
when cosmic rays hit the moon.
What's the production rate for making
transuranic elements from this process?
What fraction of the universe's element 118
was made in earthbound accelerators?
2009-06-11 Thursday 15:34:41
of the full moon. This is presumably when the moon is at
But "full moon" historically described when the moon was at its
brightest in the sky.
Does the moon's
ever make the moon observably brighter at some time other than at
2009-06-07 Sunday 10:27:20
With continuous thrust, it takes less energy
to eject an object from the solar system than
to crash it into the sun. This isn't the case for
satellites in low-earth orbit, since they
skim the atmosphere already. For geosynchronous satellites?
Where is the boundary?
2009-02-13 Friday 08:41:34
A metric for cheap eating: calories per dollar?
2009-01-27 Tuesday 11:48:35
that part of the auto-industry bailout may be a "car
czar." How many "czars" are there in the government, anyway?
2008-12-09 Tuesday 10:34:41
How strong is the correlation between income tax witholding /
refunding and tolerance for government spending?
2008-10-14 Tuesday 23:05:05
When using χ2
minimization to estimate parameters
from some data set, what fraction of the fits stop converging in
the "wrong" place?
2008-09-28 Sunday 16:55:01
You can't interact with a physical system without disturbing
it, though you can ignore the disturbance in the limit where
ħ is small. Similarly, you can't interact with a market
for some product (by asking or buying or offering or selling)
without affecting the "market price" seen by others, but
you can neglect that change unless your exchanges comprise a large
fraction of the market. There is some correspondence here. Clearly
it'd be easy to take this correspondence as justification for
saying some really dumb things. Are there any useful insights
2008-09-26 Friday 14:50:23
What's the pressure inside an unopened soda bottle (or can)?
What's the rate at which CO2
comes out of solution
at ambient pressure? How much does the bubbling change the
temperature of the liquid?
2008-09-23 Tuesday 19:19:09
NPR has reported twice in the past couple weeks that NASA managers
have expressed anxiety about the upcoming mission to service the
Hubble telescope. Because the Hubble orbits further above the
atmosphere than the ISS, where most shuttle missions have gone
recently, the chance of the shuttle colliding with some space junk
is "double" that on recent missions. Doubled from what?
2008-09-20 Saturday 08:28:36