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seen Dec 25 '13 at 22:24

Dec
26
awarded  Yearling
Dec
25
comment Is it possible to use the parabolic shape of a rotating fluid to measure the angular frequency of the rotation of the Earth?
I've posted a followup question. physics.stackexchange.com/q/91315/17198 I find I disagree with Paul Hickson on a specific point. My take is that while the rotation of Earth effect on the Mercury mirror can be mitigated with a tilt of the axis, it cannot be eliminated.
Dec
25
asked Mercury mirror telescopes: is it possible to eliminate the rotation of Earth effect?
Dec
25
comment Is it possible to use the parabolic shape of a rotating fluid to measure the angular frequency of the rotation of the Earth?
@Qmechanic I assume the advantage of linking to the abstract page is that it serves as a permalink. If a new version of the article becomes available the abstract page will offer a link to the latest version.
Dec
25
revised Is it possible to use the parabolic shape of a rotating fluid to measure the angular frequency of the rotation of the Earth?
Correction: the other mercury mirror telescope was a 3 meter device
Dec
25
revised Is it possible to use the parabolic shape of a rotating fluid to measure the angular frequency of the rotation of the Earth?
fixed an ypto
Dec
25
answered Is it possible to use the parabolic shape of a rotating fluid to measure the angular frequency of the rotation of the Earth?
Nov
1
answered Why does a CD work as a diffraction grating even with light from a light bulb?
Oct
19
revised Interpretation of contribution of gravitational potential energy to the gravitational field
Acknowledged contribution by Trimok in the later edit
Oct
19
revised Interpretation of contribution of gravitational potential energy to the gravitational field
Edited the title and added a section in response to valid criticism in comment by Trimok
Oct
19
asked Interpretation of contribution of gravitational potential energy to the gravitational field
Oct
15
comment How do EM waves propogate?
@opethDamnation The distinction between electric field and magnetic field is an artefact of describing electromagnetism in terms of classical mechanics. In terms of relativistic physics there is a single field: the electromagnetic field. The visualization of EM wave propagation as mutual induction of electric and magnetic fields isn't necessarily wrong (it's good classical physics), but it doesn't carry over to relativistic physics. No theory is exhaustive, we make do, but relativistic physics is deeper than classical physics of course.
Oct
14
awarded  Student
Oct
13
comment Obtaining a measurement very indirectly
erm... what you wrote comes up short. In stating my question I point out that all measurement is indirect. I asked for examples of particularly indirect setup. Your attempt at an "answer" points out (cautiously) that 'most measurements are indirect'. That is, you merely regurgitated my starting point. That said, the example of the Millikan oil drop experiment is a particularly poignent case. As discussed by Feynman, Millikan's original result was off by about 1%, more than five times the asserted standard error.
Oct
12
asked Obtaining a measurement very indirectly
Oct
12
answered The Equivalence principle of General Relativity and the Doppler Effect
Sep
25
revised Is it possible to trap smoke or a smoke like gas inside a glass bubble?
fixed an ypto
Sep
25
answered Is it possible to trap smoke or a smoke like gas inside a glass bubble?
Sep
20
comment How do people work out the trajectories of planets and stars just by looking at them?
@JerrySchirmer: Yes, there are indirect ways of figuring out the size of the solar system. Being obtained indirectly, the distance figures are less accurate than the angular position data, but still. About an hour before your comment I had updated my answer to include that information. Anyway, for verification at the level of accuracy that Kepler wanted the calculations had to implement both rules correctly; the rule for shape of the orbit and the rule for change of velocity over time. The lower precision of the distance figures did make things more difficult.
Sep
20
revised How do people work out the trajectories of planets and stars just by looking at them?
Added information