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Results tagged with physics
Search options questions only
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user 3869
For questions about the scientific discipline that concerns itself with analysing the laws of nature in full generality
9
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1
answer
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Context behind Planck's "A new scientific truth does not triumph by convincing its opponents...
The open access paper Lehtola & Karttunen (2022) Free and open source software for computational chemistry education (found in this answer) contains the following paragraph:
2 FREE AND OPEN SOURCE SO …
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0
answers
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What exactly was Lagrange's "grave mistake" with respect to rotating bodies under hydrostati...
A comment below What would be different about satellite orbits if Earth were prolate? Would we have Sun-synchronous and Molniya orbits? got me reading Wikipedia's Jacobi ellipsoid which begins:
Be …
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5
votes
1
answer
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Looking for references to an experiment on the evaporation rate of water in sunlight
I've even asked a related question in Physics SE (Rate of direct (non-thermal) photon-induced evaporation of water?
) several months ago, but so far no bites. …
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5
votes
1
answer
314
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Did old Crookes Radiometers ever have a pair of terminals?
This is a question about old physics lab equipment.
This and this question led to the question in SciFi SE Crookes Radiometer at the end of a telescope in old movie scene, something about a comet? …
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5
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1
answer
339
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How was the first parabolic telescope mirror made, and how was it used, and for what kind of...
This answer to When was the first true Gregorian telescope built? explains:
Newtonian uses one concave and one flat mirror (or just one concave).
Gregorian uses two concave mirrors, and
Cassegrain us …
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4
votes
1
answer
412
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Where does "the grating equation" come from? Does it have a another name?
What we often refer to as Snell's law:
$$n_1 \sin(\theta_1) - n_2 \sin(\theta_2) = 0$$
has quite a bit of history behind it. It can be demonstrated in several ways, one of which is by asserting that a …
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3
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0
answers
188
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Upon which incorrect equation of Euler did Sophie Germain rely in her work that won a prix e...
Wikipedia's Sophie Germain; Work in elasticity; Subsequent attempts for the Prize says:
Germain had derived the correct differential equation (a special case of the Kirchhoff–Love equation),31 but he …
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3
votes
1
answer
249
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Where exactly did George Brown publish the first paper about Turnstile antennas?
In its most basic form the Turnstile antenna is two half-wave dipole antennas that are perpendicular and driven 90 degrees out of phase. For a recent review see Crossed Dipole Antennas: A review (also …
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2
votes
1
answer
285
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When was the speed of sound first "correctly" calculated?
I am not a student of thermodynamics, but I will reproduce some equations and discussion from Wikipedia to highlight the principles involved in obtaining a fairly accurate — one percent perhaps — valu …
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2
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1
answer
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Did Cyrano de Bergerac's space ship have retro-rockets?
In this answer I cite and quote some surprising information; that the real Cyrano de Bergerac (not the one in the play) had written of using a rocket ship to go to the Moon circa 1650.
As strange as …
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2
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0
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Where can I find Lagrange’s original equilateral triangular solution for arbitrary masses?
This answer to What kind of triangle is formed by three unequal masses in a circular restricted three body orbit? explains that
In the Newtonian limit, an equilateral 3-body solution exists for an …
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0
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What was the last "hole" in the electromagnetic spectrum where amplified, tunable, narrow-ba...
We had radio amplifiers that could transmit powerful signals and those were pushed to microwaves. We had lasers that were originally natural transitions in solids and gasses but now tunable lasers go …
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First use of the term and principle of dynamic pressure — Daniel Bernoulli?
I have read in several places that both the developed concept and the term for dynamic pressure as it pertain to fluid dynamics was first published in Hydrodynamica by Daniel_Bernoulli, but I can not …
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