5,286 reputation
1329
bio website keith-s-thompson.github.com
location San Diego, CA
age 55
visits member for 2 years, 11 months
seen Aug 25 at 22:20

I'm a programmer and all-around nerd living in San Diego, California.
I work at JetHead Development Inc.

E-mail: Keith.S.Thompson@gmail.com


Sep
23
answered Is it possible to hear the past?
Sep
23
revised ratio between work and heat
Typo in title
Sep
23
comment Since radioactive material decays how is it possible that there is any left after 4.5 billion years?
Yes, but the creation of heavy elements in stars doesn't significantly affect the abundance of such elements on Earth.
Sep
21
awarded  Custodian
Sep
16
comment How does space affect the human body (no space suit, no space craft)
@CraigFeinstein: Nope. Your skin itself provides enough pressure to hold you together.
Sep
13
comment Would you be weightless at the center of the Earth?
@Nick: So an object released at the geocenter would fall away from the point of zero acceleration? That seems counterintuitive.
Sep
12
revised sun-moon-earth anomaly
A few more details
Sep
12
comment sun-moon-earth anomaly
I don't see how the phase of the Moon would affect this, unless perhaps it's easier to judge the direction when it's a thin crescent.
Sep
12
comment Would you be weightless at the center of the Earth?
This question and my answer are closely related, though I don't think this question is an exact duplicate.
Sep
12
comment Would you be weightless at the center of the Earth?
What does "pgal" mean (Google was unhelpful)? And if the acceleration is non-zero at the center of mass, due to the non-uniformity of the Earth's shape, am I correct in assuming there's a point where the acceleration is zero? How far from the geometric center is that point, and in what direction?
Aug
21
comment Turning Jupiter into a star
"Jupiter is big, and Jupiter is cold" -- Big, yes. Cold, not so much. The interior is believed to be very hot, about 36,000 Kelvins at the core boundary.
Aug
18
comment black hole event horizon
Possibly relevant (and possibly wrong).
Aug
18
revised black hole event horizon
edited body
Aug
14
comment Can an electric motor force angular momentum not to be conserved in an isolated system?
Angular momentum is still conserved in the system consisting of the skater, the motor, and whatever the motor is attached to (probably the planet). Why do you think the skater will weigh less?
Aug
10
comment Can fusion and fission happen at the same time, in the same place?
@GustavoBandeira: References for what? The composition of the Sun is, I think, fairly common knowledge, and I provided a references for "About 67 elements have been detected in the solar spectrum" and for "spontaneous fission". My answer is a (reasonable, I think) extrapolation from that information.
Aug
10
revised What is the escape velocity of a Black Hole?
Mention event horizon
Aug
10
comment What is the escape velocity of a Black Hole?
Where the "surface" is the event horizon. There isn't necessarily any material surface there.
Aug
7
revised Can fusion and fission happen at the same time, in the same place?
Perpetual motion, H-bombs
Aug
7
answered Can fusion and fission happen at the same time, in the same place?
Aug
7
comment Why are planetary systems so rare?
Not yet, but New Horizons is on its way with the bad news.