1,215 reputation
722
bio website dotancohen.com
location
age 37
visits member for 3 years, 2 months
seen yesterday

Oct
14
comment How did Kelvin make this fascinating calculation?
This is such a beautiful answer, I wish that we could star answers as opposed to questions.
Oct
1
comment How empty of fuel are spacecraft booster rockets typically?
@David: Replace "half kilo" with "small but not infinitesimal" and "ipod" with "dirt, pollen, personal items, lice, urine still in the bladder, bird poop on the craft exterior, and other things that are not easily accounted for mass directly".
Sep
10
comment Should I abandon my thought experiment about time?
Note that watching a natural clock (the orbits of the moons of Jupiter) approach and recede (as the Earth and Jupiter got closer and further away) was one of the hints that led to the developments that led to the understanding of the speed of light, and also of the dimensions of the solar system.
Jul
25
comment Calculate loudness of sound: why am I getting contradictory answers?
I see now where my confusion was. Thank you for showing the maths explained, and especially for the comment which explains why the perceived value to my ears is so much lower that what the maths make us expect.
Jul
25
comment Calculate loudness of sound: why am I getting contradictory answers?
Thank you. You certain understand how to phrase the ideas into terms that are easier to digest, and to address the points of confusion.
Jul
25
comment Calculate loudness of sound: why am I getting contradictory answers?
That wikibook is terrific, thank you!
Jul
25
comment Calculate loudness of sound: why am I getting contradictory answers?
@BMS: Yes, it looks like you are correct. Thank you.
Jul
25
comment Calculate loudness of sound: why am I getting contradictory answers?
Thank you Edward. Considering then the facts as you've stated them, a 1 ton bomb dropped 45 KM away is as loud as an NHRA Dragster right next to someone? That just does not seem realistic!
Jul
25
comment Calculate loudness of sound: why am I getting contradictory answers?
Thank you. The online information that I've been able to locate has been loose in their interpretations and strict in their expectations of the level of knowledge of the reader. Thank you for stating it so clearly!
Jul
25
comment Classic home experiments for an 8-year-old child
@Seanosapien: Then post them.
Jul
24
comment Is it possible for a physical object to have a irrational length?
+1 I especially love the physics questions which border on the philosophical. Philo: love, sophia: wisdom. That describes every physicist that I've ever known.
Jul
24
comment Is it possible for a physical object to have a irrational length?
@JerrySchirmer: Your last sentence sums up my experience with the fairer sex as well.
Jul
20
comment Why did nuclear testing not result in nuclear winter?
@CountIblis: That is actually quite a terrible article for the BBC. They keep saying an unquantified "the laws of nature" and I don't think that they know what it means.
Jul
9
comment How effective is speeding?
Seeing that the question asks for "insights or calculations" and specifically in the title asks "how effective" speeding is, I see this answer as exactly on-topic. Costing more money is one of the "effects".
Jul
8
comment Can you create mass with $E=mc^2$?
Could you please provide some links for the layman? I'm not even sure what to google for.
May
27
comment Why does hot water clean better than cold water?
Beautiful answer! Welcome to P.SE!
May
27
comment Why does hot water clean better than cold water?
@fibonatic: I tend that 'Not even wrong' is in fact an answer.
May
6
comment Why can't we see gases?
Fill a balloon with water, hold it above your head, and release the water. Is water invisible?
May
1
comment Where does deleted information go?
I think that you've addressed the side of the question that was not asked! We've seen that happen before.
Apr
8
comment Precession period matching solar year
@Kvothe: Thank you, that is a wonderful video. I haven't seen the whole thing yet, but I will. However, interesting as it is, the video does not address the question of a stable 1:1 precession:year ratio.