8,177 reputation
1728
bio website en.wikipedia.org/wiki/…
location United States
age 70
visits member for 3 years, 7 months
seen 10 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.


Nov
25
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
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
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.
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
24
comment Intuitive meaning of a special case of the Bernoulli equation
Look here.
Oct
24
comment Intuitive meaning of a special case of the Bernoulli equation
@JánLalinský: This is my favoriate explanation. It assumes incompressibility by assuming $\rho$ is constant.
Oct
23
comment Intuitive meaning of a special case of the Bernoulli equation
+ @JánLalinský: The only thing that can accelerate a fluid is pressure, providing force that works through a distance, producing kinetic energy in the fluid. I think that's what Kyle is saying.
Oct
22
comment finding equation of a water droplet
Aren't water droplets like rain basically spheres?
Oct
20
comment Speed of sound and Break the sound barrier
@A.khalaf: This is right, and the reason for the conical cloud is the sudden pressure and temperature drop (in humid air) behind the shock wave.
Oct
12
comment Benefits of rear spoiler in cars
It helps it accelerate off the showroom floor.
Oct
10
comment If i had a aero-nautical object
The California Condor has a 10-foot (length, not body part :) wingspan and weighs up to 26 pounds (weight, not money:). So if the wind is about 25% faster than a condor flies, it might work.
Oct
10
comment What is the power in this circuit if the voltage is doubled?
@Floris: You're right. I was doing back-of-the-hand physics.