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
22
awarded  Popular Question
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.
Aug
10
awarded  Yearling
Jul
25
awarded  Excavator
Jul
25
revised Why does a wobbly metal sheet make the sound of thunder?
Removed redundant appeal to opinion.
Jul
25
suggested suggested edit on Why does a wobbly metal sheet make the sound of thunder?
Jul
25
accepted Calculate loudness of sound: why am I getting contradictory answers?
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
asked Calculate loudness of sound: why am I getting contradictory answers?
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.