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2d
awarded  Nice Answer
May
14
answered How do eagles fly slowly for a long time?
May
14
comment Saturn V F-1 engines and beyond
If you only care about peak power then Project Orion en.wikipedia.org/wiki/Project_Orion_(nuclear_propulsion) is probably the winner
Apr
24
comment Can we find the exponential radioactive decay formula from first principles?
@dmckee it's unavoidable if the decaying nuclei are independent. If there was any field between atoms you could have a different law.
Apr
22
comment Car motor heat to drive a steam engine
en.wikipedia.org/wiki/Automotive_thermoelectric_generator
Apr
22
comment True randomness via Radioactive decay
yes, yes, and physics.stackexchange.com/q/105107
Apr
20
comment Measuring depth or height from sea level
It's a famous problem science20.com/news_articles/…
Apr
20
answered Why are magnets made in only a few shapes?
Apr
19
revised Is electric current a scalar quantity?
added 13 characters in body
Apr
19
comment Is electric current a scalar quantity?
@ACuriousMind - good point, I was think in terms of the question
Apr
19
answered Is electric current a scalar quantity?
Apr
19
comment Single particle passing through the double slit at a time
@JohnRennie - I think the question is slightly different, the OP is confused about why you need a single photon. And I think it's useful to have some different answers to the same question at different levels.
Apr
18
answered Single particle passing through the double slit at a time
Apr
17
comment Why does the lake surface appear darker in some areas?
@GreenAsJade, yes I thought I made that clear, it was just an example.
Apr
16
revised Why does the lake surface appear darker in some areas?
added 29 characters in body
Apr
16
comment Why does the lake surface appear darker in some areas?
In this image I suspect the lighting difference is totally from the surface, it is at such a low angle of incidence and the water is probably heavily sedimented (guessing from the location)
Apr
16
answered Why does the lake surface appear darker in some areas?
Apr
16
revised What would happen to me if I was in the LHC while it was running?
added 187 characters in body
Apr
9
comment Why do snorkelers not need to wear corrective glasses when snorkeling with goggles on?
Also under water you can't see as far, visibility is at best 10m, and you aren't reading road signs or anything else in detail - so "in focus" is a bit less strict
Mar
26
comment Refraction of light marching band analogy
@JeroenMoons - how does the light know is possibly the most fundemental question in physic! One suggestion is that all paths are tried in multiple universes and we end up in the one with the shortest path. And that is one of the more 'sensible' suggestions