1,161 reputation
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bio website dotancohen.com
location
age 36
visits member for 2 years, 11 months
seen 2 hours ago

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 How does hot water clean better than cold water?
Beautiful answer! Welcome to P.SE!
May
27
comment How 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.
Jan
15
comment Beads in 'perpetual motion'?
@GlenTheUdderboat: Nice, thanks!
Dec
25
comment Beads in 'perpetual motion'?
I'm going to have to work on my Japanese, that looks like just what I'm looking for! Welcome to physics.SE!
Dec
8
comment Does the strength of a smell depend on the volume or surface area of an agglomerate of material?
Thank you. Your first paragraph correlates strongly with my intuition, but your second paragraph addresses a very possible reason why the lower-surface-area dog shit stinks worse! And your third paragraph is now answered!
Sep
16
comment Lowest gravity on Earth's surface?
Relevant article
Sep
15
comment A machine which copies any object with 100% accuracy?
Which qualities? Macroscopic qualities such as functionality? Microscopic qualities such as surface defects? It goes back to my statement that the properties to be copied have to be well-defined.
Jul
19
comment Why aren't gas planets and stars fuzzy?
possible duplicate of Why is Jupiter so sharply defined?
Jul
9
comment Beads in 'perpetual motion'?
Wow, thanks, that is a great edit! It is so elegant once I see it! I assume that v is the initial velocity imparted by the hand? Thank you!
Jul
8
comment Beads in 'perpetual motion'?
Thank you. I suppose then that there is very little friction in this system? Also, I am having a difficult time determining a method for calculating the amount of force being exerted on the floor.
Jun
26
comment Why is the Pegasus launched from a subsonic airplane?
Thank you, I did not realise everything else in the launcher.
Jun
26
comment Why is the Pegasus launched from a subsonic airplane?
Thank you. I don't see any information even suggesting that the M-21 crash was due to to a supersonic separation.
Jun
26
comment Is space “real”, or is it some sort of accepted postulate?
Spacetime
Jun
26
comment Is space “real”, or is it some sort of accepted postulate?
I see, Peter, you mean the dimensions of space. You'll be happy to known that we can in fact measure them, and there there are more than just three of them!