#video of gyroscopic precession #toread #physics #Smarter-Every-Day
on 02026-01-15#Veritasium #video about negative energies in relativistic quantum #physics
on 02025-12-10the resistance of a shaft to twisting scales as the fourth power of its diameter! #mechanisms #physics
on 02025-08-10Hestenes’s #dissertation on using #Clifford-algebra and geometric calculus for particle #physics from 01963. No full text.
on 02025-05-20#video on quantum #physics by #Veritasium walking through the principle of least time with the beach example, Maupertuis’s principle of least action, the Ultraviolet Catastrophe, Planck’s solution, the photoelectric effect, Bohr’s computation of the hydrogen spectrum, de Broglie’s matter-wave hypothesis, etc. At 22'30" he derives the least-action principle from the quantum-variational stationary-phase principle.
on 02025-03-06#physics #video of “impossible” Brennan torpedo powered by pulling a cable out the back to drive its propellers
on 02024-12-03how electrons can be conducted by metals, in terms of #quantum #physics
on 02024-09-17#Veritasium #video about #entropy in #physics, explaining Carnot efficiency and thus the rudiments of #thermodynamics, but not explaining even the units of entropy; he chose to include stock footage clips instead of equations. But he does include a bargraph of how much entropy was in the early universe and how much is in stars, neutrinos, empty space, the CMB, and the Milky Way’s central black hole, so it’s still pretty informative.
on 02024-07-06#Mythbusters #video failing to cut slaughtered pigs in half by cutting a taut cable and letting it snap. #physics #safety Also an #archaeoacoustics test with a pottery wheel.
on 02024-06-28#ebook #toread Procedures In Experimental Physics, by John Strong. “Many procedures for the #physics lab, including: glass-blowing, high #vacuum, electrometers, Geiger counters, optics, heat and high temperature, and [#manufacturing] techniques. Profusely illustrated by Roger Hayward.” #CC #public-domain because 01938 copyright not renewed
on 02024-06-24#pendulum #physics with differential equations under #cc by
on 02024-02-21#pendulum #physics #calculator
on 02024-02-21discussion of Greg Egan’s #physics #tutorial
on 02024-01-12Greg Egan’s #tutorial on special #relativity, general relativity, black holes, and #quantum mechanics, featuring “how the central idea of each theory leads to detailed, quantitative predictions of real physical effects”. #physics
on 02024-01-12#paper on #Landau’s curriculum for undergraduate #physics
on 02023-07-02Lev #Landau's curriculum for undergraduate #physics
on 02023-07-02Jaynes's paper about how applying #Jeffreys style #Bayesian probability to #physics clears up a lot of mysteries
on 02023-06-27#3D #physics #simulation for #games
on 02023-01-04implies without saying that insulators become intrinsic semiconductors at high enough temperatures #band-structure #physics
on 02021-12-19“In addition, all insulators become conductors at very high temperatures as the thermal energy of the valence electrons is sufficient to put them in the conduction band.” metals? or semiconductors? or first semiconductors, then metals? or just plasma? #band-structure #physics
on 02021-12-19“Junction #mott-transition field effect transistor (JMTFET) and switch for logic and memory applications” #band-structure #physics #patent (expired)
on 02021-12-19“Correlated Electron Materials and Field Effect Transistors for Logic: A Review” #Mott-transition #band-structure #physics
on 02021-12-19“A heterojunction modulation-doped Mott transistor” #Mott-transition #band-structure #physics
on 02021-12-19“The effect is known as a #Mott-transition and can be used to build smaller field-effect transistors, switches and memory devices than possible with conventional materials.” #band-structure #physics #electronics #hardware
on 02021-12-19main article on "band structure" in #physics
on 02021-12-19“A "Mott transition" is a metal-nonmetal transition in condensed matter. Due to electric field screening the potential energy becomes much more sharply (exponentially) peaked around the equilibrium position of the atom and electrons become localized and can no longer conduct a current.” A sudden transition, which can be provoked by temperature, pressure, or doping. #physics #band-structure
on 02021-12-19the Fermi level is what needs to be in a conduction band to get a metal or near two of them to get a semiconductor #physics #band-structure
on 02021-12-19resistivity of intrinsic semiconductors decreases exponentially with temperature; does that mean any insulator becomes a semiconductor if it survives to a high enough temperature? #physics #band-structure
on 02021-12-19#physics #tardigrades live tardigrades in entangled quantum states and (unrelatedly) dangerously radioactive “anti-5G” bracelets and sleeping masks
on 02021-12-19#physics #divulgation of the Kosterlitz–Thouless transition for which the 02016 #Nobel-Prize in Physics was awarded
on 02021-11-12“The Crackpot Index. John Baez. A simple method for rating potentially revolutionary contributions to #physics: ... 8. 5 points for each mention of “Einstien”, “Hawkins” or “Feynmann”.” #humor
on 02021-11-12a brief explanation of the quantum #physics of flame colors
on 02017-01-14#physics #education recommendations for people who aren’t in school
on 02016-10-12Maybe dark matter in #physics is really just modified gravity and not particles at all
on 02016-10-11#physics #PDF #paper by John D. Norton questioning #Landauer’s principle. #reversible #computability
on 02016-10-03book review of a book marketing string theory. Contains memorable quote, “Marketing, advertising, and product promotion are commercial tactics with the very purpose of affecting their targets’ objectivity. These tactics shouldn’t have any place in science.” #physics
on 02016-08-12drawing a bow across a metal plate with sand on it moves the sand to the vibrational antinodes in a “Chladni figure”, discovered in the 1600s. You can also stimulate it with a loudspeaker to probe the #resonance frequencies and patterns. #physics
on 02016-08-02the #physics of the Faraday cage is surprising; the amount of shielding depends on the wire diameter!
on 02016-08-01HyperPhysics has a parametric model for inductor design that you can play with here. #physics
on 02016-07-12“Relativistic-microwave theory of ball lightning” #physics
on 02016-06-27"The #Physics of Scales", an #ebook #pdf about how modern physics (Maxwellian electrodynamics, gauge theory, quantum mechanics, and relativity) are not scale-free. #toread
on 02016-04-29“Extending Landauer’s Bound from Bit Erasure to Arbitrary Computation”, by David H. Wolpert, showing a minimal bound on the energy consumption of even reversible computation. #physics #cs #entropy
on 02016-01-06