6,271 reputation
1322
bio website en.wikipedia.org/wiki/…
location United States
age 69
visits member for 2 years, 7 months
seen 41 mins ago

BS Mechanical Engr.
PhD CS(AI)
CS Prof (4yr)
Numerous consulting jobs.
15 yr at http://www.pharsight.com
Published book on CS & several articles
4 kids, 2 grand
Pilot(student)

P.S. The picture is a Beta-prime distribution. It shows the program speedup factors you can get if you see a problem twice in 2, 3, 4, and 5 samples.


May
15
revised Turning an Airplane. What actually causes the circular motion in a banked (roll) turn?
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May
15
revised Turning an Airplane. What actually causes the circular motion in a banked (roll) turn?
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May
15
answered Turning an Airplane. What actually causes the circular motion in a banked (roll) turn?
May
14
comment Apollo and orbital mechanics: orbital decay if the Trans Earth Injection (TEI) burn had failed
Well (sheepishly) I tried, but it won't take small edits. But it's a great answer. It never dawned on me that the raisins in the muffin would have that much effect on orbits, but on low orbits, of course they would. I suppose the perturbations would affect both high and low apsides.
May
14
comment Apollo and orbital mechanics: orbital decay if the Trans Earth Injection (TEI) burn had failed
Grammar grump here :) I would say "perturbed".
May
14
comment Apollo and orbital mechanics: orbital decay if the Trans Earth Injection (TEI) burn had failed
OK, I learned something. Good question.
May
13
comment Apollo and orbital mechanics: orbital decay if the Trans Earth Injection (TEI) burn had failed
Where have you heard that orbits about the moon could decay? I'm doubtful that variation in the gravity field could cause that. I can't think of any kind of tidal drag that could do it either.
May
13
comment What are brain waves?
@Ron: I studied computer science (under Minsky), including automata theory, but I was not able to follow Penrose's argument of 1) how a brain could out-do a deterministic automaton, or 2) how the brain could do so by means of quantum computation.
May
12
revised About space-time and its four dimensions
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May
12
answered About space-time and its four dimensions
May
12
comment Human perception of distance
Things at a distance look smaller because they subtend a smaller angle. It's simple geometry. Is this what you're asking?
May
12
comment Human perception of distance
I don't think the OP is asking how binocular vision works.
May
11
comment Find drag force on link of rotating chain
I was not able to view the video, and I assumed the chain was fastened in the center and was being swung around. I just noticed you said a closed chain. Is the chain in the shape of a circle, spinning like the rim of a wheel? If so, I need to change my answer.
May
11
revised Find drag force on link of rotating chain
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May
10
revised Find drag force on link of rotating chain
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May
10
revised Find drag force on link of rotating chain
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May
10
revised Find drag force on link of rotating chain
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May
10
answered Find drag force on link of rotating chain
May
8
comment What's the reason for the seasons?
Your diagram is slightly wrong. The white ellipse with the arrow on it, representing the rotation of the Earth, should be tilted to the right by 23 degrees so it is perpendicular to the north-south axis. And there is a big temperature difference between day and night - we just don't call it seasons.
May
7
comment Why is exhaling more forceful than inhaling?
That's what I was going to say, for the same reason the flow around a fan is not symmetric fore and aft. Going into the fan it is simply being drawn from all directions, but coming out of the fan it has momentum in one direction, so forms a jet.