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location Seattle, WA
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visits member for 1 year, 9 months
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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.


Apr
2
revised Could one measure a stick to an arbitrary precision by having its length estimated by enough people?
added 757 characters in body
Apr
1
comment Could one measure a stick to an arbitrary precision by having its length estimated by enough people?
What if everyone had a different measuring rule manufactured in the same factory - and made of green wood - which shrank 0.1% over time? The inaccuracies would not average out.
Apr
1
revised Tsunami dampening mechanisms
added link to paper about natural tsunami barriers
Mar
30
answered Could one measure a stick to an arbitrary precision by having its length estimated by enough people?
Mar
29
answered Tsunami dampening mechanisms
Mar
28
comment Tsunami dampening mechanisms
This recent paper published in Nature: Taming hurricanes with arrays of offshore wind turbines immediately came to mind when I read your question.
Mar
25
comment How do we know that earth is not perfect sphere?
+1 Good point - I have responded to your comment in the answer body
Mar
25
revised How do we know that earth is not perfect sphere?
added 1528 characters in body
Mar
25
revised How do we know that earth is not perfect sphere?
added 1528 characters in body
Mar
25
answered How do we know that earth is not perfect sphere?
Mar
25
revised How do we know that earth is not perfect sphere?
because geodesy is a part of geophysics
Mar
24
comment Why is the geomagnetic north pole at a different location from the magnetic north pole?
Another way to say this is that the geomagnetic poles are by definition required to be antipodal (it's the best fit to a dipolar field.) The observed magnetic poles are not so required.
Mar
24
comment What is the longitudinal difference between the sub­solar point and the magnetic poles at time $t$ (hours)?
You should be able to obtain the longitude of the solar point at t from that calculator. Check the reference where you obtained that formula to determine the sign convention - otherwise you might try a simple case you know the answer to determine the sign convention. Also be sure to take care with your units.
Mar
24
answered What is the longitudinal difference between the sub­solar point and the magnetic poles at time $t$ (hours)?
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