Tag results for physics
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Results from all user's collections (592 out of ~592)
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quantum levitation - meissner effect
Bookmarked 573 weeks ago video courtesy of the association of science-technology centers astc representing the science center and museum field worldwide to learn more visit wwwastcorg follow us on twitter: sciencecenterstel-aviv university demos quantum superconductors locked in a magnetic field wwwquantumlevitationcom for an explanation of the physics behind this demonstration visit wwwquantumlevitationcomlevitationthe_physicshtmlthe physics behindwe start with a single crystal sapphire wafer and coat it with a thin 1m thick ceramic material called yttrium barium copper oxide yba2cu3o7-x the ceramic layer has no interesting magnetic or electrical properties at room temperature however when cooled below -185c -301f the material becomes a superconductor it conducts electricity without resistance with no energy loss zerosuperconductivity and magnetic field do not like each other when possible the superconductor will expel all the magnetic field from inside this is the meissner effect in our case since the superconductor is extremely thin the magnetic field does penetrates however it does that in discrete quantities this is quantum physics after all called flux tubesinside each magnetic flux tube superconductivity is locally destroyed the superconductor will try to keep the magnetic tubes pinned in weak areas eg grain boundaries any spatial movement of the superconductor will cause the flux tubes to move in order to prevent that the superconductor remains quottrappedquot in midair |
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india plans 039safer039 nuclear plant powered by thorium environment the guardian
Bookmarked 739 weeks ago use of relatively low-carbon low-radioactivity thorium instead of uranium may be breakthrough in energy generation |
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john moore and dr brooks agnew on freedomlink radio 1-13-2011 - earth changes
Bookmarked 780 weeks ago |
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soft robot walking and crawling
Bookmarked 735 weeks ago harvard researchers have created a soft robot inspired by animals like starfish and worms read more: http:spectrumieeeorgautomatonroboticsmilitary-robotsfreaky-boneless-robot-walks-on-soft-legs |
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science off the sphere: 121 legowatts
Bookmarked 706 weeks ago nasa astronaut don pettit gets creative with an educational lego kitaboard the international space station answer the challenge questionat wwwphysicscentralcomsots for a chance for prizes |
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why it039s hard to land on mars
Bookmarked 441 weeks ago support minutephysics on patreon http:wwwpatreoncomminutephysicsthis video is about why it039s harder to successfully land spacecraft and landers and rovers on mars than on earth or venus or the moon or titan or asteroids it all comes down to atmospheric density when there039s no atmosphere you can do a powered descent in a flimsy tinfoil spacecraft like the lunar module and when there039s plenty of atmosphere you can do an unpowered descent via heat shield and parachutes like the space shuttle apollo command module soyuz huygens etc but on mars with its thin air you have to do both powered amp unpowered descent getting the worst of both worldsthanks to hoppy price from jpl for fact-checking this videolink to patreon supporters: http:wwwminutephysicscomsupportersreferencesspreadsheet to calculate landing success rates: https:docsgooglecomspreadsheetsd1jqezcg56ubkvd_wsyw3gd-qd9tasaw1rpaiz-1bcuaeeditusp=sharingnasa low density supersonic decelerator fa |
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how physics saved two million premature babies
Bookmarked 463 weeks ago this video is in collaboration with bill and melinda gates you can check out the gates annual letter here: http:b-gates2lhhtmjdoctors beat back a disease that was killing tens of thousands of babies a year with a machine based on a simple principle of physics thanks to bill and melinda gates for their financial support thanks also to our supporters on https:wwwpatreoncomminuteearth___________________________________________fyi: we try to leave jargon out of our videos but if you want to learn more about this topic here are some keywords to get your googling started: preterm birth: the leading cause of death of children under five years old prematurity occurs for a variety of different reasonsrespiratory distress syndrome: a syndrome in premature babies caused by insufficient production of pulmonary surfactant alveoli: tiny air sacs in the lungs that allow for rapid gas exchangepulmonary surfactant: a mixture of lipids and proteins that decreases surface tension in the alveolila |
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black holes neutron stars and white dwarfs collab w minuteearth
Bookmarked 437 weeks ago watch the minuteearth video here i promise it039s really really really good: https:wwwyoutubecomwatchv=pai1n96t8vkminutephysics amp minuteearth are on patreon: http:wwwpatreoncomminutephysics and http:wwwpatreoncomminuteearththis video is about the differences between the corpses or final degenerate dense star forms that dead stars take: black holes neutron stars and white dwarfs the main distinguishing features between them are the mass cutoffs chandrasekhar limit and tolman-oppenheimer-volkoff limit the matter that makes them up electrons protons neutrons singularity and what holds them up against gravity not thermal pressure from nuclear fusion like in a star like the sun but electron or neutron degeneracy pressure fermi pressurepauli exclusion principle and the strong nuclear force and nothing in the case of a black holereferences:chandrasekhar limit: https:enwikipediaorgwikichandrasekhar_limittolman-oppenheimer-volkoff limit: https:en |
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tesla039s cybertruck tug-of-war stunt was pointless
Bookmarked 318 weeks ago here039s why tesla cybertruck towing a ford f-150 is meaninglessa tale of physics electric trucks and why tug of war doesn039t matter subscribe for new videos every wednesday - https:googlvzstk7during the tesla cybertruck reveal elon musk showed the world that the cybertruck can pull a ford f-150 uphill at initial glance you might think wow that039s an impressive feat surely the tesla039s electric torque helps it rip the f-150 in this battle of quotwho039s got the bigger driveshaftquot unfortunately physics informs us these kind of demonstrations are entirely pointlesswe039ll discuss the actual wheel torque of the tesla cybertruck as well as the ford f-150 we039ll look into both vehicles weights and we039ll analyze the video to determine if the ford is rwd or 4wd ultimately we039ll all land on the conclusion that everything we witnessed was pointless that039s the story of life enjoy related videos:electric ford f-150 towing stunt - https:youtubeau3u72cx74iford raptor tows tesla model 3 - https:yo |
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the unreasonable efficiency of black holes
Bookmarked 417 weeks ago thanks to https:brilliantorgminutephysics for sponsoring this video check out their black hole course at http:brilliantorgminutephysicsblackholesupport minutephysics on patreon http:wwwpatreoncomminutephysicslink to patreon supporters: http:wwwminutephysicscomsupportersthis video is about how efficient various reactions are at converting mass to energy as we know from the einstein mass-energy equivalence of e=mc2 antimatter is very efficient but it is not naturally-occurring chemical reactions like fire or explosions are very inefficient nuclear fission and nuclear fusion are better but not amazing on an absolute scale non-rotating black holes schwarzschild and rotating kerr are by far the most efficient due to their accretion disks and very small radius of their innermost stable circular orbits references:periodic videos hydrogen explosion in slow motion: https:wwwyoutubecomwatchv=qotgeetb_kacia world factbook norway energy consumption: https:webarchive |
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carl sagan on advanced civilizations visting earth
Bookmarked 778 weeks ago would a technically advanced civilization visit the earth |
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chemistry tutor washington dc
Bookmarked 455 weeks ago this makes it clear that online math tutoring washington dc classes will offer all the benefits of offline lessons and more for more information visit : http:hometutoringforsuccesscomtutors_washington_dc_reading_writing_mathhtml |
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the big bang theory video - the russian rocket reaction - cbscom
Bookmarked 742 weeks ago this week the big bang theory is one full hour and sheldon says the words you never thought you |
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tiny transistor
Bookmarked 723 weeks ago in a remarkable feat of micro-engineering unsw physicists have created a working transistor consisting of a single atom placed precisely in a silicon crystalhindi version:http:youtubezxfj-12zsi8german version:http:youtubevuwhbaqafhi |