7,754 reputation
2719
bio website akhmeteli.org
location Houston, TX
age
visits member for 2 years, 9 months
seen 9 mins ago

7h
answered Beryllium Vacuum Sphere Boat/Aircraft
21h
answered Is a suit that hides a soldier's heat signature fundamentally possible?
Oct
15
answered Can circularly polarized light be transmitted through a fiber
Oct
14
comment Are critical exponents below and above the critical point always same?
@Steven Mathey: I worked in the area of exactly solvable problems of statistical physics very long time ago, so I am not sure I can offer an explanation. The authors of the referenced article offer some comments. See also their article arxiv.org/abs/1012.0607v1 , where "The reasons for the violation of the scaling law hypothesis and the universality hypothesis for the models are clarified."
Oct
13
answered Why can't de Broglie waves be electromagnetic in nature?
Oct
12
comment Pulling on a weakened rope - where will it tear?
@Glen The Udderboat: I agree, in principle, but I assume that the rope mass is very low, so significant tension develops only when the tension wave returns after reflection from the wall. Otherwise, the wall is irrelevant.
Oct
12
answered Pulling on a weakened rope - where will it tear?
Oct
12
answered Are critical exponents below and above the critical point always same?
Oct
11
answered Finding charge density from from differential form of gauss law
Oct
11
answered How can I get some conductive polymer (silicone like), with 1 Ohm/cm resistance?
Oct
5
comment Simple estimation of the critical temperature of water
@Steven Mathey: No, I cannot. I guess you need to remember the density of liquid water (I remember it, of course) and, probably, the surface tension coefficient of water (I don't remember that).
Oct
5
comment Simple estimation of the critical temperature of water
@Steven Mathey: Are you asking if I can estimate these parameters from the first principles? I think it can be done (and it looks like there are a lot of articles on this issue), but I lack time and motivation to do that, sorry.
Oct
5
answered Why radiant heat only travels as infra-red waves and not as other types of em waves like UV rays
Oct
5
comment Simple estimation of the critical temperature of water
@Floris: I believe so (en.wikipedia.org/wiki/Van_der_Waals_force : "The term [the Van der Waals force] includes: force between two permanent dipoles (Keesom force)[;] force between a permanent dipole and a corresponding induced dipole (Debye force)[;] force between two instantaneously induced dipoles (London dispersion force)." See also en.wikipedia.org/wiki/Van_der_Waals_constants_%28data_page%29
Oct
5
answered Simple estimation of the critical temperature of water
Oct
4
answered Twisting a tightly fitting rod
Oct
4
comment What is the final velocity of a stone dropped out of a rising balloon?
@pcforgeek: At least if you assume that, you get the answer from your book.
Oct
4
comment What is the final velocity of a stone dropped out of a rising balloon?
@pcforgeek: I believe it was "released from rest without any push" with respect to the balloon, not with respect to the ground.
Oct
4
answered What is the final velocity of a stone dropped out of a rising balloon?
Oct
4
answered What is the difference between the shapes of molecules with different isotopes