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location Seattle, WA
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visits member for 1 year, 11 months
seen 4 hours ago

I participate on this site because I really enjoy physics and because I would like to learn more about what makes an online community work well. Questions often interest me more than answers – although I think the best answers are grounded in observation and experiment. I’m optimistic that there are still many surprising discoveries yet to be made in the physical sciences. I believe physicists should be good citizens. I believe my children will know things about the natural world I can’t even imagine – and will learn them in ways quite different than how I was educated.


Mar
23
awarded  Good Question
Mar
22
revised What is the longest distance over which echolocation is effective?
edited tags
Mar
19
answered How does quantum world affect us and why should I care about it?
Mar
17
comment Are leptons, baryons and energy the only products of radioactive decay?
@Brandon Enright - An element is defined by it's atomic number. A nuclear reaction that changes the atomic number transmutes the reactant atoms into atoms of other elements plus (possibly)other products. Anna's answer explains, as I understand it, that at high energy the products would include 'elementary particles' - which is also properly referred to as 'matter'- although at this scale the duality of matter/energy and particles/waves become significant.
Mar
14
comment what determines the wavelength of waves on the open ocean?
What may not scale well is the action of the model boat bobbing in the water.
Mar
14
revised what determines the wavelength of waves on the open ocean?
add ref to wikiwaves.org
Mar
14
comment what determines the wavelength of waves on the open ocean?
I believe your graph is showing a single slice of the boundary of a "fully developed sea" which is a theoretical maximum limit of the size of wind waves. Larger actual waves have been observed. Wind fetch and duration are also shown in that table as having comparable effect as wind velocity.
Mar
14
answered what determines the wavelength of waves on the open ocean?
Mar
14
revised what determines the wavelength of waves on the open ocean?
these really should be identified with geophysics and oceanography tags
Mar
13
comment If a planet were cut in half but stayed hemispherical, how hot would the ocean on the flat side be?
I think questions about hypothetical game situations probably aren't covered here. The moderators will most likely close this unless you can pose your question for a real physical situation.
Mar
10
reviewed Approve suggested edit on Do we stand on the earth because of Newton's third law?
Mar
9
accepted Are leptons, baryons and energy the only products of radioactive decay?
Mar
7
asked Are leptons, baryons and energy the only products of radioactive decay?
Mar
7
comment Meteorite from Mars?
Hard to imagine a process that would lead to such 'noise.' Note that the first four elements are 'noble gasses' - these they do not chemically react with other elements to form compounds that might alter there abundance in the sample. I think @DavePhD is still correct to say (even 15 years later) that meteorite-geochemists think the Mars hypothesis is highly probable.
Mar
7
comment How is this process not quasi-static yet reversible?
I think your question would be much easier to understand if you included a drawing of the system you are describing.
Mar
4
comment Meteorite from Mars?
Good answer, thanks for including those references. I am unable to vote up, but will retry later. Because many of the readers on this forum are not chemists, you might also want to include an explanation that the evidence is a combination of major element, trace element, and isotopic evidence.
Mar
4
awarded  Enthusiast
Mar
2
revised about the rotation of the earth and gravity, when all continents were merged
typo
Mar
2
comment The physics of sound boards
Yes but a sound board would have multiple harmonics.
Mar
1
answered about the rotation of the earth and gravity, when all continents were merged