mirage effect helps researchers hide objects
Bookmarked 743 weeks ago
the paper is available to download here - http:iopscienceioporg0957-44842243435704 quotmirage effect from thermally modulated transparent carbon nanotube sheetquot aliev a et al 2011 nanotech 22 435704

domino chain reaction
Bookmarked 711 weeks ago
a domino can knock over another domino about 50 larger than itself a chain of dominos of increasing size makes a kind of mechanical chain reaction that starts with a tiny push and knocks down an impressively large dominooriginal idea by lorne whitehead american journal of physics vol 51 page 182 1983see http:arxivorgabsphysics0401018 for a sophisticated discussion of the physics

traffic waves
Bookmarked 773 weeks ago
main site: http:trafficwavesorgwatch at 0:01 to see the fight that causes this exit-lane backup not the worse example i039ve seen thoughon seattle i-5 this left exit-only lane is usually backed up by a 12-mile during rush hour the left exit ramp leads into the high speed quotexpress lanesquot under the city but if it039s jammed you039ll lose more time in the jam than you gain from getting on to the express lane also if you miss getting into that lane early then you039re screwed since nobody in the row of 200 cars will let you in merging drivers coming in from righthand ramps are blocked by those already in the jam and while stuck in that jam you have to sit in line for many minutes driving like 2mph just a few drivers occasionally force their way in aggressively but that nearly halts the exit-lane flowbut if i let ten cars merge ahead of me as i approach the jam like magic the whole thing evaporates and everyone takes off at high speed sometimes it doesn039t work every timeunfortunately this video can039t show you the view from above also you can039t see behind me so you can039t see that my quotholequot is the only one in a very long row of cars also you can039t see the size of the reliable daily jam that was there on every other day or the jam ahead of me before i arrived and started draining the jam by letting people mergenote that letting some cars get ahead of you is nothing it doesn039t slow you down on a 30min congested commute at 65mph 2sec between cars if you instead drove 5mph slower than the rest how many other cars would pass you seventy five in other words you039re only a quotslowpokequot when a stunningly huge numbers of cars pass you on the same commute letting a few 10 cars merge will slow you down insignificantly: by 20sec out of 30min or less than 1mph slowing 645mph not 65mph ten cars one way or another is too small to matterconversely if you want to drive significantly faster than everyone else then you need to pass 50-100 other drivers to shorten your commute by a minute or two if you only managed to pass a few cars that039s called failure and your speed wasn039t increased enough to matternote: trolls ampamp spammers blocked immediately zero tolerance

solar power without solar cells: a hidden magnetic effect of light could make it possible
Bookmarked 767 weeks ago
physorgcom -- a dramatic and surprising magnetic effect of light discovered by university of michigan researchers could lead to solar power without traditional semiconductor-based solar cells

a flight simulator in excel based on real physics - part 1
Bookmarked 576 weeks ago
this is an animated 2d flight simulator created in excel 2003 based on real physics that you can download for free at http:wwwexcelunusualcom the polars of the main wing and stabilizer airfoils profiles were modeled in xflr5 then imported in excel where 5th order polynomial interpolations were extracted from all the curves a formula for linear interpolation between known reynolds numbers was then used the forces and momenta were extracted then newton039s second laws in linear and angular domain were applied to find linear and angular accelerations linear and angular speeds and coordinates were obtained by a basic euler two step integration process the main wing is based on an airfoil used by prof mark drela of mit in his bubble dancer dhlgnra foot locker champs eastbay end of the world suzy favor hamilton december 21 2012

why are airplane engines so big
Bookmarked 507 weeks ago
the physics behind the perfect size of a jet enginethanks to http:wwwaudiblecomminutephysics for supporting this video if you try the free 30-day trial i recommend quotender039s gamequot by orson scott cardthanks for everyone who supports minutephysics on patreon link to patreon supporters here: wwwminutephysicscomsupportershtmlthe answer to this question has everything to do with drag amp kinetic energy vs momentum change thrust ie a bigger engine fan allows for a larger air mass to be accelerated a smaller amount to give the same thrust as youd get from a smaller engine with larger acceleration any acceleration of air imparts energy to that air which is in principle wasted energy so ideally we minimize the acceleration of air while maintaining constant thrust aka bigger engine fan however bigger fans have more drag so there is an ultimate size limitreferences:a350 schematics - http:wwwaerospaceweborgaircraftjetlinera350747 schematics - http:wwwaerospaceweborgaircraftjetlinerb747music by nathaniel schroeder http:wwwsoundcloudcomdrschroederminutephysics is on google - http:bitlyqzewc6 and facebook - http:facebookcomminutephysicsand twitter - minutephysicsminute physics provides an energetic and entertaining view of old and new problems in physics -- all in a minutecreated by henry reich

sdo: magnetic tendrils 20120314 1080p
Bookmarked 718 weeks ago
the magnetic fields of a pair of active regions are seen connected to each other over hundreds of thousands of miles in this video clip mar 14-16 2012 like thin twisted vines the field lines from each stretched out above the sun and established a link with the other charged particles are spinning along the field lines making the lines visible in extreme ultraviolet light the material being observed here is ionized iron heated to over a million degrees 171 angstrom wavelength looping arcs of field lines can also be seen above each of the active regions often the sources of solar stormscredit: nasa gsfc sdosource: http:sdogsfcnasagovgallerypotwphpv=itemampampid=93

how big is the universe
Bookmarked 714 weeks ago
follow me on tumblr again http:edwardspoonhandstumblrcomtour de nerdfighting cd available now: http:dftbacomproductzp2012-tour-de-nerdfighting-albumin which hank explains how and why phycisists think that the univers has no edge

physicist leonard susskind rejects intelligent design
Bookmarked 599 weeks ago
complete video at: http:foratv20080723leonard_susskind_-_the_black_hole_warstanford university theoretical physicist leonard susskind rejects the idea of quotintelligent designquot as a theory for the origins of the universe-----recognizing a contradiction in stephen hawking039s claim that things disappear in black holes susskind and gerard t039hooft offered a counterargument aimed at disproving this controversial theorysusskind discusses the story behind the black hole conflict and how it has led to a better idea of how our universe works - the commonwealth club of californialeonard susskind is a theoretical physics professor at stanford university in the field of string theory and quantum field theory susskind is widely regarded as one of the fathers of string theory for his early contributions to the string theory model of particle physics

foratv - neil gershenfeld: the future of fabrication
Bookmarked 759 weeks ago
analog phone calls degraded with distance we now have the internet analog computations degraded with time we now have pcs but today

universal gripper: shooting hoops amp throwing darts
Bookmarked 724 weeks ago
researchers at cornell university and the university of chicago have expanded the capabilities of their robot gripper inventionthe jamming gripper is essentially a latex balloon filled with granular material such as coffee grounds fill the balloon with air and the grounds conform to the shape of any object at hand pump air out of the balloon and the grounds jam into solid mass enabling the gripper to hold tight to its object previously the gripper could pick up a variety of multi-sized objects pour a glass of water or write with a pen now with the rapid re-inflation of the balloon the gripper also can shoot miniature hoops throw darts and go bowlinguchicago physicists led by heinrich jaeger developed the concept of a conforming gripper based on the jamming and unjamming of granular material while cornell engineers led hod lipson invented the new functionalities and built the gripper prototypesvideo credit: john amend and hod lipson cornell university

idttmwytim: schrodinger039s cat
Bookmarked 712 weeks ago
quoti don039t think that means what you think it meansquot examines scientific theories that have taken on a life of their own in popular culture ampamp we help you understand what they really mean in scientific terms today we take on schrodinger039s cat the famous thought experiment by austrian physicist erwin schrodingerlike scishow on facebook: http:wwwfacebookcomscishowfollow scishow on twitter: http:wwwtwittercomscishowreferences for this episode can be found in the google document here:http:dftba-2djzschrodinger schrodinger039s cat physics physicist austria einstein newtonian physics quantum mechanics subatomic particles superposition thought experiment observation zombie alive dead many worlds alternate universe universe science fiction theory theoretical radioactive radiation geiger counter

spinning water galaxies - interesting fluid physics - the slow mo guys
Bookmarked 551 weeks ago
gav and dan whip out some johnnies to show you some awesome spinning liquid physics follow gav on twitter - https:twittercomgavinfreefollow dan on twitter - https:twittercomdanielgruchywatch our favourite videos - https:wwwyoutubecomplaylistlistbuy shirts here http:storeroosterteethcomsearchtype=productampq=slowmofilmed on a phantom flex at 2500fps and phantom flex 4k at 1000fpsspinning water galaxies - interesting fluid physics - the slow mo guys

fano flow
Bookmarked 763 weeks ago
certain non-newtonian fluids which are elastic display a large resistance to extensional flow such behaviour leads to fluid flow arrangements which are simply not possible using ordinary newtonian fluids these so-called fano flows manifest themselves in a varietyof ways in the so-called 039039tubeless039039 syphon a fluid can be made to flow up through an unsupported liquid column above the free surface of the liquid one way to achieve this is by slowly withdrawing and raising a syringe from a pool of the liquid belowin the so-called 039039open channel039039 syphon after initially commencing theflow of an elastic fluid from say a beaker the fluid will continue toflow up the side and over the lip of the beaker for sometime despite the level of its free surface having fallen considerably below the top of the beaker in this way the slightest spill will cause the beaker to partly empty in what is commonly refereed to as a039039self-syphoning039039 effect

amazing pendulum wave effect
Bookmarked 763 weeks ago
add me on facebook: https:wwwfacebookcompagesbrusspup158773774166995click the like button on facebook to add mebe sure to watch the entire video to see all of the patterns that are created at the end of the video there are 2 links to watch 2 more versions of the videothis is a very well known effect that has been performed a countless number of times i wanted to try and different version by using the black lights and also to add a little production value instead of just simply showing the effectthe effect works by using a formula that provides the specific length for each string when all of the pendulums are started at once the patterns will start to form the pattern resets after about 1 minute i glued white poster board on the sides of the nuts and used a black light causing the white to glowyou can download this song on itunes:http:itunesapplecomusalbumbreak-emotion-singleid399452730name of song quotbreak emotionquotcheck out 2 more versions of the pendulum wave effect:http:wwwyoutubecomwatchv=fuqahhsrmbyhttp:wwwyoutubecomwatchv=ezm_-2o8ovifollow me on twitter: http:wwwtwittercombrusspup