7,630 reputation
1628
bio website en.wikipedia.org/wiki/…
location United States
age 70
visits member for 3 years, 2 months
seen 20 hours 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.


20h
comment When an aircraft flies over, glass window vibrates…Infrasound?
Just my guess - there's no reason the noise can't go into frequencies below what you can hear (about 20 hz). Of course if it makes your windows hit their frames, those clicks will be at a higher frequency so you can hear them. Nothing strange about that.
Nov
22
comment Torricelli with constant vertical drain speed
I don't understand the question.
Nov
21
comment Why are flight feathers asymmetric?
I'm guessing it's to match the pressure distribution, which is greater toward the leading edge. Whether the wing is swept back or not is not the issue.
Nov
20
comment How are Newton's Laws of motion related to the amount of work exhibited by the balloon vehicle?
Looks like homework. Put some effort into it.
Nov
17
answered Is more lift always better?
Nov
13
comment What exactly are light waves?
It's a good idea to study Young's double-slit experiment. I like to think of it as a wave of alternating electric and magnetic fields, but it also acts as a probability amplitude wave of a photon appearing. So when the waves interfere, they're changing the probability of photons appearing.
Nov
11
comment What prevents this rotational perpetuum mobile from working?
The two red wheels at the bottom are turning against each other. If they have friction, them all the kinetic energy turns into heat energy. If they are gears, then the wheels can't even start. $w_1$ has nothing to do with it.
Nov
7
comment Trajectory of a bomb dropped from an aeroplane
As @Omen said, we're trying not to be a homework completion service.
Nov
5
comment Is velocity responsible for motion or motion responsible for velocity?
"Motion" is a loose term. It does not have a firm definition, so when it is used in physics its meaning has to be evident in context.
Nov
4
comment hydrodynamic entrance length [developing flow]. Non-native speaker needs some help
I think your English is not bad. I think the sentence is fairly clear, although I don't understand the content.
Nov
3
answered Steering a motorcycle
Nov
3
answered Measuring small amounts of lift in a wind tunnel
Oct
30
revised Fluid flow through an orifice
added 128 characters in body
Oct
30
answered Fluid flow through an orifice
Oct
30
comment Fluid flow through an orifice
You say you know the area of the orifice, but it does not have constant diameter. That's confusing.
Oct
29
comment How to prevent water droplets becoming larger on the tip of a nozzle?
@Meriam: Related: Kelvin's water dropper.
Oct
29
comment How to prevent water droplets becoming larger on the tip of a nozzle?
@Meriam: You could try. You would need signal generators and stuff. It should work with water, after all, that's what makes lightning.
Oct
29
comment How to prevent water droplets becoming larger on the tip of a nozzle?
@Meriam: FWIW, here it is. And another (1970).
Oct
29
comment How to prevent water droplets becoming larger on the tip of a nozzle?
@Meriam: Now that you remind me (duh), my own father patented a related technology, when he worked on the first ink-jet printers in the 50s. The ink was dielectric, and he used electrostatic forces to cause ink to be drawn out of the nozzles in just the desired droplets, and then steered onto the paper like in a cathode-ray tube.
Oct
29
answered How to prevent water droplets becoming larger on the tip of a nozzle?