8,387 reputation
1730
bio website en.wikipedia.org/wiki/…
location United States
age 70
visits member for 3 years, 8 months
seen 7 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.


Jan
29
comment The Z-Torque: how can it be shown intuitively that it does not work?
My way of saying this is: Pretend you're a foot. Something stiff is constraining you to move in a circle about a center. If that something is straight or crooked you can't even see, because you're a foot.
Jan
28
revised The Z-Torque: how can it be shown intuitively that it does not work?
added 167 characters in body
Jan
28
revised The Z-Torque: how can it be shown intuitively that it does not work?
added 348 characters in body
Jan
28
answered The Z-Torque: how can it be shown intuitively that it does not work?
Jan
27
answered Is it possible for a physical object to have a irrational length?
Jan
26
comment Quantum Computing Power Advantages
@Juan: I agree. I was just trying to keep the answer short for an unsophisticated OP. I've experimented with a simulation of Grover's algorithm.
Jan
25
answered Quantum Computing Power Advantages
Jan
25
revised The viscous force between the layers of liquid is same, then why there is variation in the velocities of its layers?
edited title
Jan
24
answered The viscous force between the layers of liquid is same, then why there is variation in the velocities of its layers?
Jan
23
revised Potential energy of a spring
edited body
Jan
23
comment Potential energy of a spring
You should know better :) The energy is the integral of $Fdx$. Your gravitational example is only good at short range where you can assume $mg$ is constant. Over a longer range it is not constant, and spring force is not constant either.
Jan
22
comment Transformators (primary and secondary windings)
@Ylyk: Well, it's got to matter, because a factor of 1.4 in voltage is a factor of 2 in power, so you could burn things out if you misunderstood it.
Jan
22
comment Transformators (primary and secondary windings)
@Ylyk: You'd have to read the placard on the transformer. I think it's typical to be rated in terms of peak voltage, not rms.
Jan
22
answered Transformators (primary and secondary windings)
Jan
22
comment Why aren't gas planets and stars fuzzy?
Since you're asking this to make people think, and I bet you could make a good answer, why don't you answer it yourself?
Jan
18
comment How much effect does the Bernoulli effect have on lift?
@Alyosha: Pretend you're a wing. You can only be lifting if the pressure underneath exceeds the pressure above. Then pretend you're a slug of air. This wing comes along, cuts you in half, then pulls/pushes you downward. Same thing.
Jan
18
answered What causes an aircraft to roll when rudder is applied
Jan
18
comment How much effect does the Bernoulli effect have on lift?
@Marty: I just think John S. Denker's book is terrific. He's a flight instructor, world-class physicist, and great teacher. I can read his stuff over and over and keep getting more out of it.
Jan
18
comment How much effect does the Bernoulli effect have on lift?
@Alyosha: There really isn't a larger thing. If you really want basics, you can go back to Newton's laws. Bernoulli's principle is just a consequence of Newton's laws.
Jan
18
comment How much effect does the Bernoulli effect have on lift?
@Marty: Yes. There is more than one way to analyze it.