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Physics Goes To Hollywood

pigreco314 writes "What do films like Independence Day, Armageddon and X-Men have in common? The answer is that apart from costing millions of dollars to make, they all feature in a new course called Physics in Films that is being taught to students at the University of Central Florida, according to PhysicsWeb. Costas Efthimiou, the mathematical physicist who teaches the course, believes that non-science students learn more about the fundamentals of physics by studying films and science fiction than they do from more traditional approaches." Among the topics discussed is "the conservation of momentum in Tango and Cash."

58 of 228 comments (clear)

  1. in related news by mirko · · Score: 5, Interesting

    mind this studies :)

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    1. Re:in related news by shmokey · · Score: 2, Insightful

      When's the last time you saw a movie where an explosion in space does not make any noise?

      Akira...

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  2. ummm.. by zcat_NZ · · Score: 5, Funny

    For every slashdotting, there is an equal and opposite failure of the webserver?

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  3. Sounds fun... by shrykk · · Score: 5, Informative

    But it's just another course trying to entice non-science students to do science. What's the point?

    In UK universities in 2003, there were around 35,000 applications made to study Sports Science BSc. To study Materials Science, 37. Just thirty-seven.

    Which do you think produces better scientists?

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    1. Re:Sounds fun... by samhalliday · · Score: 5, Insightful
      But it's just another course trying to entice non-science students to do science

      no... its really not. the guy giving the course theorises that the general public learns more from movies than school classes. he doesn't want more physics students; he meerly wishes the movies to more accurately portray physics, and not have more classic "mission to mars" physics (newton? who was he then?)

      Which do you think produces better scientists?

      well, even that's debatable ;-) [by the way, i think your numbers are off... my UG uni alone takes about 20 students a year on materials physics]

    2. Re:Sounds fun... by shrykk · · Score: 2, Informative

      The source was Professional Engineering Magazine. Probably have the issue around somewhere.

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    3. Re:Sounds fun... by YOU+LIKEWISE+FAIL+IT · · Score: 5, Insightful
      But it's just another course trying to entice non-science students to do science. What's the point?

      To answer your question in general:

      What's the point? The point is that we need as many people as possible gaining as much exposure to science education as possible. You don't teach people about things like "scientific method" or the notion that we have theories that are constantly revised under scrutiny, or Occams razor, and 20 years down the line you have a five billion dollar a year "magnetic medicine" industry.

      Sadly, as it's not legal for me to wait around the corner and thrash the people coming out of, say, the magnet shop with a broom, it looks like the best we can do is try to educate their children to think for themselves. Here's a prescription: scientific education helps treat and prevent anxiety, gullibility and irrational prejudice.

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    4. Re:Sounds fun... by SmackCrackandPot · · Score: 2, Interesting

      In UK universities in 2003, there were around 35,000 applications made to study Sports Science BSc.

      Yes, but those 35,000 applicants all aspire to being self-employed personal trainers earning 40 pounds/hour. Compare that to the career opportunities for science graduates and can you blame them?

    5. Re:Sounds fun... by robfoo · · Score: 5, Funny

      Hey, don't knock Magnet Medicine. My uncle complained that his Windows kept crashing. So I put a couple of strong magnets on his hard drive, and hey presto - problem went away!

    6. Re:Sounds fun... by ifwm · · Score: 3, Interesting

      It sounds like you're making a value judgement about what a good scientist is. Is a psychologist, who strictly adheres to scientific method a good scientist? What about economists?

      As to the point, I submit that it helps people think SCIENTIFICALLY, i.e. using scientific method. That alone justifies the course in my book.

      UCF Class of 2001
      and hopefully 2005 as well.

  4. Course in physics by counter-examples, probably by Rosco+P.+Coltrane · · Score: 4, Insightful

    Action movies are notorious for not respecting basic laws of physics. For example:

    - A guy gets shot by a bullet, gets thrown backward 10 feet.

    - A car jumps over something without a launching pad

    - A car jumps over something and flies straight into the air, and lands flat (real cars tip forward when they do that)

    - A computer hacker does something real quick on a computer because someone's coming, downloads or save something in half a second

    - A woman drinks a tainted glass of wine, drops immediately after the first sip

    - A red-caped, blue spandexed lunatic hoists busses, entire bridges into the air ...etc...

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    1. Re:Course in physics by counter-examples, probably by acehole · · Score: 4, Funny

      A woman drinks a tainted glass of wine, drops immediately after the first sip

      rophynil: "When patience just isnt enough"

      Now in spray form, for the discreet gentleman.

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    2. Re:Course in physics by counter-examples, probably by sidb · · Score: 3, Insightful

      You forgot the best one of all, present in so many SF movies I can't even count them: the aft-thrusters-at-full-power, ship-swerving-like-it's-an-airplane, powered crash landing, complete with audible explosion and (more recently) an annulus of shockwave through the vacuum.

      True, anyone with a decent high school education should detect that as total BS, but I know many people who never even notice anything odd when spaceships routinely fly around with their engines at full power no matter what they're doing at the moment. Is it so hard to reinforce correct physics in people's minds, instead of this hogwash? Such a simple public service to perform.

    3. Re:Course in physics by counter-examples, probably by MartinG · · Score: 3, Informative

      - A car jumps over something and flies straight into the air, and lands flat (real cars tip forward when they do that)

      I agree with the main point that it tips forward while in the air, but that doesn't guarantee how it will land.

      That depends on how it was launched.

      There are many ways it could land as long as angular momentum is conserved.

      When using a ramp, gravity will have spent longer accelerating the front of the car towards the ground than the back simply because the front is unsupported by the ramp for longer. This means the cars front will tip forward as you suggest, but depending on the launch angle and speed (and other factors such as car length and mass) it could land flat if it touched the ground before it had tipped enough. Conversely if might not tip enough and could hit the ground with the back first.

      Another example could be a car jumping from a great height. If calculated properly it could complete one or more full "somersaults" in the air before landing flat (of course any normal car would be smashed to pieces in doing so because it would be in the air for so long and reach such a high downward speed)

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    4. Re:Course in physics by counter-examples, probably by Yorrike · · Score: 5, Interesting
      If you want a movie with more betrayals of science per frame than any other, watch "The Core". The concept is utterly shameful.

      A ship made of Unobtainium (granted, they joke about this in the film), drills to the center of the Earth so it can let off nuclear explosions to restart the outer core spinning, thus restoring the Earth's magnetosphere.

      On the way to the outer core, the ship encounters a geode the size of a small moon and giant diamonds, all while ignoring the fact that the upper mantle in effectively solid, and at the pressures and temperature encountered at the depth they're at, a nuclear explosion isn't going to do squat.

      The mere fact they send a manned probe down is laughable.

      Now I know it's just a movie, and having some geology knowledge, I must admit it was a laugh a minute, but it took it's self far too seriously to be given credit, never mind a character being employed to "hack the internet" and stop all documents with certain keywords moving about.

      If it were done in the style of Starship troopers, I'm sure I would have enjoyed it, but as is, bleh.

      --

      Looks can be deceiving. Or CAN they?

    5. Re:Course in physics by counter-examples, probably by Hungry+Admin · · Score: 2, Interesting

      One of my fondest memories of a final exam is a physics problem dealing with the acceleration needed for Superman to catch a baby that fell off of a skyscraper, and what acceleration was needed to slow to 0 velocity as they both reached the ground.

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    6. Re:Course in physics by counter-examples, probably by AndrewHowe · · Score: 3, Funny

      That, or the fact that most cars have 2/3rd of their weight at the front... Special effect folks and stunt drivers usually stick around 500 lbs of sandbags in the trunk to achieve that fly-flat (crash)-land-flat effect.

      The angular momentum of Galileo's rest mass just increased...

    7. Re:Course in physics by counter-examples, probably by ultranova · · Score: 3, Interesting

      You forgot the best one of all, present in so many SF movies I can't even count them: the aft-thrusters-at-full-power, ship-swerving-like-it's-an-airplane, powered crash landing, complete with audible explosion and (more recently) an annulus of shockwave through the vacuum.

      Execpt that shockwaves and sounds do travel through space.

      An explosion simply means that matter moves very fast outwards from the centre of the explosion. In an atmosphere, the moving particles hit the particles of the atmosphere and transfer their kinetic energy to them, and those particles hit other particles, and so forth. When they hit you, they transfers their kinetic energy into your outer particles, which transfer it onward, making the shockwave propagate through you, throwing you backwards (if you are light/unsecured) and causing damage as if you were hit by a blunt object (which you were - air). You sense the changing pressure as sound.

      On the other hand, in space, nothing stops the original particles from the explosion. They travel through space until they hit something. When they do, they transfer their kinetic energy into its outher layer (which will transfer it onward and so on, causing an internal compression/decompression wave), throwing it backwards and causing damage as if it was hit by a blunt object (which it was - a blunt wall of particles). If it has audio sensors, it will sense the pressure change (compression/decompression) as sound.

      Of course, a TIE Fighter should still glide silently...

      It should also be noted that, according to the theory of realitivy, when mass is accelerated, a gravity wave is created. So if you blow up a planet, it will cause a shockwave in the fabric of spacetime itself. However, due to the weakness of gravity as a force, such shockwaves are usually below notice.

      I recall reading that if Alpha Centauri would go supernova, the resulting shockwave would tear off Earth's atmosphere. But hey, that could make the ultimate sci-fi movie - Alpha Centauri is going to supernova, and the only way to stop it is freezing a group of old astronauts and sending them there in a shuttle to dig into it's core to deliver a bunch of nuclear bombs to restart fusion reaction there, all the while a black monolith ruling an evil space empire sends its space orc minions flying in space fighters that make a "swhooshing" sound as they fly by and turn on a dime, because the monolith needs the energy from an exploding star to recharge its power systems to continue its 5 million year mission to explore new worlds and civilizations and to conquer them, but fortunately the princess of the aliens (which just happen to look completely human) in the planet the space shuttle falls into after being shot down by the fighters has hots for the hero and helps him develop his magical powers, so he can help his friends when the Monolith kidnaps them and reveals it's actually his father and that the aliens really look like giant spiders and are just using their awesome telepathic abilities to make an illusion of appearing humanlike, and were actually the ones who lured the astronauts there to breed with them because they, like many spiders, eat their males after coupling, and have none left anymore, and how he, the monolith, has send his armadas to attack and conquer Earth, but fortunately the hero manages to resolve the problem with his spider lover with an clever use of a gag, causing the spiders to alliy themselves with Earth and drive off the invaders, which is fortunate because the monolith has destroyed their home planet in a fit of rage, bt fortunately the power of love between the hero and the spider allows them to defeat it, marking the beginning a new age of enlightenment and really kinky interspecies relationships in Earth (literally in, because everone forgot about the supernova, but fortunately Earth turned out to be hollow, with a new, primordial world inside, and primordial savages turned out to be no match for the enlightened army of surface humans armed with flame throwers and assault rifles, not to mention missiles and nukes, helped by giant kinky cannibalistic telepathic space spider chicks).

      Oscar gala, here I come :) !

      --

      Forget magic. Any technology distinguishable from divine power is insufficiently advanced.

    8. Re:Course in physics by counter-examples, probably by Dark+Lord+Seth · · Score: 2, Informative
      A woman drinks a tainted glass of wine, drops immediately after the first sip

      Actually, if you use the right chemicals under good circumstances, along with a few careful preprations , this will actually work. The effect will last about 6 hours after which the woman will wake up, not recalling anything at all. Even better, the body will remain warm, supple and won't discolour.

      Or so I heard... Ahem.

    9. Re:Course in physics by counter-examples, probably by roman_mir · · Score: 2, Informative

      Well, you missed the best parts then:
      The scene with the shuttle. The whole thing - the radars not working for some reason, the GPS failing and no-one noticing (it must be the pilot's fault.) Maneuvring the shuttle as if it was not a brick but an F16.

      Noone in the entire science community outside of the small group of the primary participants noticing the disappearence of the magnetic field and of the secondary data - Aurora Borealis, or the fact the compases don't work any more :) The ionosphere that must now be not at only 70 to 400 km but surrounding the entire planet at 0-400 km.

      Partial failure of the Earth's magnetic field. Not a full failure, but partial, where some of the magnetic field is breached above some places but the rest is still holding around the globe. Solar radiation powerfull enough to burn people's skin BBQ style in 3 seconds. Crazy local weather changes (this is grey area.)

      A nuclear reactor small enough to fit in a few cubic meters and powerfull enough to push that 'earth-ship' forward, to power those 'ultra-sonic' lasers. Unexplained propelling system that works under water, under ground and in a pressurized ionized metal cloud. The 'Unobtanium' and the lasers etc. invented by some lonely geek in a desert within only 30 years with minimal funding. An apparatus that allows to see through meters of lead, the machine that displays something like an X-Ray without having sensitive film on the other side of the material that is being looked at. Fully working prototypes, everything necessary for just the occasion.

      Constant real-time radio contact with the surface of the earth and stupid communication problems within the ship itself from compartment to compartment (those wires are a bitch to make work well without failing most of the time.)

      Building only one manned ship for 50 Billion, not 100 of unmanned ones for 5000 Billion (shouldn't this be the entire world's problem, wouldn't everyone chip in? Only a year left to live for all of us.) The meere notion that any problem can be solved by throwing enough money at it within a very limited time constraint (yeah, this is an IT personnel site, is this the standart way of solving problems at work or what?)

      A pressure and heat suit that is definetly under-designed for the intended usage, a suit that looks like it's made of polyester and tin-foil but that can take 5000 atm. (or smth like that) and not even slightly compress. A suite that is designed for half of the temperature that it was used in but still protecting a human inside it just long enough for him to heroically finish the job. This human still able to use his eyes while the lenses in his eye-glasses have cracked under pressure. (what kind of pressure would that be - really tight eye-glasses frames?)

      Glyding in the core of the planet at huge speeds allowing to cover the entire core in about half an hour. Magically using 'rods from the reactor' that looked more like heavy water containers, to increase a nuclear bomb's blast from 100Megatonn to 150-200Megatonn.

      Coming up with a magical solution to the energy problem by using 'unobtainium' under pressure to power the ship. Getting all of this to work in under an hour. Glyding from inside the planet to the outer mantel without navigation systems and without those magical sonic-lasers.

      A hacker who looks and acts like a cartoon character. A hacker who has control over the entire world with just a telephone by beeping into the mic. A hacker who finds a secret gov't project on the internet, hacks into it and stops the music (wouldn't it be much easier for him to stop most of the electrical power-plants that supplied the energy for that gigantic 'laser'). Oh well, maybe I am just jealous :)

  5. Sounds awfully familiar by heironymouscoward · · Score: 2, Informative

    Can't quite find the previous Slashdot story though this one is close.

    But Tango and Cash dangling from electric cables as part of a physics course? This is kinda old news.

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  6. Physics Goes to Hollywood by boltoflightning · · Score: 3, Interesting

    I thought your post was very interesting.

    I say WHATEVER WORKS. People (not just kids) don't always learn what is taught by traditional means. I know --i-- didn't. Seeing something visually or in new ways can sometimes more easily or quickly create understanding.

  7. Useful Links.... by Scrab · · Score: 5, Informative

    Movie physics site

    BBC Link

    And would they cover things like the cranking the van up the sand dune in Ice Cold In Alex

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    1. Re:Useful Links.... by amembleton · · Score: 2, Informative
      And would they cover things like the cranking the van up the sand dune in Ice Cold In Alex

      The BBC with Open University did a series called Hollywood Science. They covered Ice Cold in Alex. Click here for more info.

  8. BBC/OU "Hollywood Science" by alanw · · Score: 4, Informative
    The BBC and the Open University have produced a series Hollywood Science in which Robert Llewellyn (Kryten in Red Dwarf, Scrapheap Challenge/Junkyard Wars) examines the science behind Hollywood movies.
    Can Jackie Chan really bend iron bars? Is Paul Newman's stomach capable of holding 50 eggs? Does that bus really have enough Speed to jump the gap?
    1. Re:BBC/OU "Hollywood Science" by robbyjo · · Score: 3, Interesting

      Summary:

      • Can Jackie Chan really bend iron bars? (Shanghai Noons)
        Yes, because cotton is stronger when wet.
      • Is Paul Newman's stomach capable of holding 50 eggs? (Cool Hand Luke)
        No. His mouth would've run out of saliva or wouldn't be able to hold the water if he decided to drink.
      • Does that bus really have enough Speed to jump the gap? (Speed)
        No. It's too far, not to mention wind resistance and the angle.
      • Can aluminium dingy in Dante's Peak really melts?
        No. Aluminium would take a whole lot of stronger acid.
      • Can crank shaft of the 1930's truck to winch it backwards up the sand dune really set it free from the gulch? (Ice Cold Alex)
        Possible, although the cranker needs quite a lot of water.
      • Can John McClane just wrap a hose and leaps to the side of the building when it explodes? (Die Hard)
        Impossible. The hose wouldn't be able to hold the acceleration due to gravity
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    2. Re:BBC/OU "Hollywood Science" by Bobartig · · Score: 2, Insightful

      If competative eaters can polish off 50 hotdogs in under 12 minutes, I'm sure our protagonist can do fifty eggs... unless they were OSTRICH eggs.

      --
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  9. Movies can't depict real physics by Stuwee · · Score: 4, Insightful

    Since they're currently experiencing a "server failure", I can't comment on the course content as such, but there are vital pieces of physics that simply cannot be taught from watching a movie. You can talk about conservation of energy in a car crash, sure. You can laugh at the physical impossibility of that bit in Hollow Man where the chick opens a door with an electromagnet. You could even try to talk about "time folding over" in Event Horizon.

    The fact of the matter is however that physics is made interesting when you actually think about it yourself and realise why it is interesting. If someone makes a movie that makes relativity or quantum physics interesting enough to justify the cost of the movie, then I take my hat off to them.

    This just sounds like another course to fill credits.

  10. The problem... by toesate · · Score: 3, Insightful

    is essentially due to traditional classroom coaching method which leave little room for imagination.

    On the other hand, Physics(or Science) illustrated in movies, could in a few subtle scenes, tickle the itch to followup, run imagination wild, to validate or invalidate flaws or ideas, just for the sake of geekiness.

    I only wished that factual subjects can be written like novels, with a page turner storyline...

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  11. Matrix by dj245 · · Score: 3, Funny
    The Matrix: Revolutions, unfortunately, did not make the list of top 3 movies that were physics accurate, due to the complete disregard for the rules of physics.

    I guess the machines forgot what theories Newton came up with, so thats why all the theories taste like chicken.

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  12. History too by cvd6262 · · Score: 2, Interesting

    One of my best professors used to say that history is only there to help us understand movies.

    No different?

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  13. Why? It's fiction anyway by October_30th · · Score: 5, Interesting
    Is it so hard to reinforce correct physics in people's minds, instead of this hogwash?

    And why should we want to? As a physicist I am more annoyed by the people who insist on having correct physics in movies (or books) than the incorrect physics itself.

    Hello? It's a movie! Not a documentary or part of a curriculum. At least to me hard sci-fi like R.L. Forward's Dragon's Egg is immensely boring.

    --
    The owls are not what they seem
    1. Re:Why? It's fiction anyway by gilroy · · Score: 4, Insightful
      Blockquoth the poster:

      And why should we want to?

      Because in a democracy it is the general citizenry who make the ultimate decisions, and because in this democracy much of the citizenry's information comes from the media such as movies. (That BTW itself is a scandal.)

      I don't care if the physics is wrong, if it's wrong for a reason. It's the casually-wrong things -- the things clearly wrong because the even the writer doesn't understand -- that really ticks me off.

      Remember that people will be making decisions on what to fund and what to prohibit. Do you want them making those decisions based on poor science they've picked up in the movies? How are they supposed to know it's bad scince? Well, one way (simply enough) is to tell them -- which is what these sites and courses do.
    2. Re:Why? It's fiction anyway by Fweeky · · Score: 2, Interesting

      Well, it depends how bad the physics is and how much it runs against your common sense, doesn't it? There's nothing wrong with a little poetic license, especially if you're not skilled enough to pull off something realistic, but when you constantly use it as a crutch to your pathetic talants it gets pretty silly.

      Star Trek's a perfect example, from the cartoony CGI (who needs shadows?) to disgustingly badly portrayed.. well, I could say just about anything; AI, weaponry, people, aliens.. there's no moody shadows out in deep space, no spooky red/blueshift at relativistic velocities (which suddenly don't seem so fast anymore anyway), no feel the battles are performed using city-busting+ weapons, not even a sense of the sheer scales involved in space. The less realistic stuff is just so much less interesting/spectacular/fun.

      Sure, it's harder to stick to realism because it gives you boundries you need to work in/around, but those boundries are what're interesting; not your latest dubious workaround for avoiding them.

  14. Bad examples by canavan · · Score: 5, Informative

    I always thought teaching of phsics with movie would be most efficient by showing the bad examples, so people won't start to think that reality is governed by the same mad-up laws of physics as seen in most action flicks. Lots of bad examples are listed at INSULTINGLY STUPID MOVIE PHYSICS

  15. BS in BS by Trurl's+Machine · · Score: 4, Funny

    Since most of the Hollywood movies physics is nothing but pure bullshit, this course could give you the one and only degree of double BS - Bachelor Of Science In Bullshiting!

  16. My Favorite Movie Physics Site by ChrisLeif · · Score: 2, Informative

    Insultingly Stupid Movie Physics

    http://intuitor.com/moviephysics/index.html

  17. Weep!!! by mritunjai · · Score: 2, Funny

    So you guys are now learning physics by watching movies!!!

    So, don't cry when your physics reasearch gets outsourced.

    Make learning fun... but NOT a JOKE !!

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    - mritunjai
  18. Re:it's all politics by digitalunity · · Score: 5, Insightful

    Why do you call him a mental case?

    If you don't like or don't agree with him, then just discredit him or the facts he puts in his movies. Calling him a mental case because you don't like what he has to say is just closed minded.

    It's like the media suddenly calling judges 'activist' because they don't agree with what the judges have to say. Judges are there to interpret the law, but when a conservative doesn't like something a judge says, they just label the judge 'liberal' or 'activist' instead of attacking the legal or logical basis for the judge's decision.

    When you want to disagree with someone, you don't call them names. You engage them in a debate of critical reasoning.

    Calling them names just makes you look childish.

    --
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  19. Other examples? by StateOfTheUnion · · Score: 3, Interesting

    So should the military teach combat by showing Rambo movies? Perhaps convicts can learn to be nice people by watching episodes of Family Matters. I'm thinking about opening a Salvage Yard, I'm gonna do some market research by watching Sanford and Son.

    1. Re:Other examples? by Nebu · · Score: 2, Interesting

      So should the military teach combat by showing Rambo movies?

      Actually, this might not be a bad idea. Most army recruits are young males, and as such, most of them have probably seen a couple of action movies. Pointing out irrealistic sequences in those movies would probably be a good way to correct misconceptions the general public might have about tactics.

      One example that immediately comes to mind is showing them a clip of someone ducking behind a table during a gun fight and telling the recruits that wood will not stop bullets from killing you, and so they should NOT do what the protagonist in this film is doing.

  20. Ob Die Hard stuff by gilroy · · Score: 3, Interesting
    Blockquoth the poster:

    Can John McClane just wrap a hose and leaps to the side of the building when it explodes? (Die Hard)
    Impossible. The hose wouldn't be able to hold the acceleration due to gravity

    Blockquoth the BBC site:

    By looking at the film shot by shot, we estimate that he falls about 35 floors,

    Very impressive, since it the building is only 32 or 33 floors high (indicated several times in the movie). It also implies 105 m of fire hose, which is itself ludicrous. However, the fall is "really" only a few floors (say, 4, if you take the building to be 34 floors and he ends up back on floor 30), his final speed would have been 16 m/s rather than the 46 m/s the BBC got.

    Does it matter? Well, it turns out that the BBC thinks "head shear" would have killed McClane, because his "severity index" was 3018, way above the fatal number (about 1000). But their speed is high by a factor of about 3, and the speed appears in that equation raised to the 2.5 power. So his "real" idex would be about 16 times lower, or 190.

    But interestingly, this is only about half of the index required to knock you out. So actually, using numbers more consistent with the film, you find that not only does McClane survive the fall, he is not knocked out!

    All of the stress arguments also depend on this bad speed, but since they concluded he'd survive the overly-strong stop, he's OK at the lower speed too.

    BTW, I don't know how elastic firehose is, but they neglected its retarding effect as he fell, too.
  21. Another chance for Hollywood to redeem itself by chrism238 · · Score: 2, Interesting
    It looks like Hollywood will soon have another chance to redeem its portrayal of science in movies.

    The trailer for The Day After Tomorrow looks great, and certainly has a strong message about global warming in the film (just don't try to visit their website over a modem!) Starts May 28th.

  22. My favorite sci-fi movie calculation... by cr0z01d · · Score: 5, Informative

    I only saw previews for The Core, but I gathered that the core of the Earth had stopped spinning, and the good guys had to restart it with nukes.

    Recall moment of inertia for a sphere, I = 2/5 mr^2. The mass of the Earth's core is 1.932e+24 kg, the radius, 3.488e+6 m. This gives a moment of 9.402e+36 kg m^2. The period of the core's rotation (one sidereal day) is 8.616e+3 s, giving [E= 1/2 Iw^2] rotational kinetic energy of 2.500e+28 J. Note that SI prefixes only go up to 10^24 (unless I'm mistaken).

    Now, how many nukes would have to be used to supply this energy? One kiloton TNT is 4.184e+12 J, giving the Earth's core kinetic energy of 5.975e+15 kilotons TNT. Were we to actually use TNT, the diameter of the dynamite required would be 953 kilometers and surface gravity would be 4.5% that of Earth. But I digress.

    So, back to nukes, the highest yield nuclear weapon that the US has ever produced (I think) is the triple-stage Mk-41, with up to 25 megatons TNT of explosive yield. 2.4e+11 of these would be required to provide sufficient energy to start the core's motion. To put this in perspective, each Mk-41 being 3.4 m long, the nuclear bombs required would span the average distance between the Earth and the sun five and a half times. (Hey, a lever! Never mind that the outside edge of this ridiculous construction would be moving at .3c.)

    For the Star Trek crowd, the amount of antimatter required is half of [E=mc^2] 2.781e+11 kg. The amount of energy is the same amount that the sun releases [our nice big 4e+26 W bulb] in about an hour. Enough energy to boil all the oceans almost thirty million times over. I knew that the movie premise was absurd, but I had no idea how many orders of magnitude the absurdity was.

    I leave it as an exercise for the reader to figure out such trivia as "Where the hell did the law of conservation of angular momentum go?"

    Sources: http://www.strategic-air-command.com/weapons/nucle ar_bomb_chart.htm, CRC books, Wikipedia, and sites on the internet I forgot about =).

  23. In Hollywood: by Molina+the+Bofh · · Score: 3, Funny

    - All car bumpers are extremely explosive

    - Regular people will get knocked out by a simple punch while a hero will only get mildly scratched after running away from 10 terrorists with machine guns

    - Time is relative. You can jump into an airplane or helicopter in free and still be able to not only reach the controls, but also turn it on and recover it

    - The most l33t hackers crack other computers using nice and friendly GUIs. So getting into a file really looks like entering a building.

    --

    -
    Roses are #FF0000, Violets are #0000FF, find / -name '*base*' |xargs chown -R us && mv zig greatjustice
  24. Euphemism by Rick.C · · Score: 4, Insightful
    "The Institute of Physics Web site you tried to reach is currently unavailable.

    Due to vital maintenance work, some Institute of Physics Web sites are temporarily unavailable."

    In physics, the Slashdot Effect is called "vital maintenance work".

    How quaint.

    --
    You were 80% angel, 10% demon. The rest was hard to explain. - Over The Rhine
    "Math in a song is good."-Linford
  25. Re:same school, different course by platypussrex · · Score: 4, Interesting

    Can't get to the site to rtfa, but I had a similar course from the same University (different prof) over 25 years ago. It was called "The Physics of Science Fiction" and the premise was that we would read various works of popular science fiction (and watch some movies) and consider how the "laws of physics" were either the same or different in their universes.

    Wasn't a bad class really. We read Fred Hoyle, Larry Niven, Hal Clement, and some others that I don't remember. It gave a decent introduction to basic phsyics and was fairly popular on campus amongst the nonscience majors. (I took it because the prof was a friend of mine and said I would enjoy it.)

    Courses like this are certainly not going to replace traditional lab physics for science majors, but they can do a fine job of making science more interesting to some students who normally don't enjoy it.

  26. UCF's course.. by Planetes · · Score: 2, Informative

    This course started a couple years ago.. It's a 1000 level course which is freshman level. I've met a few people that took it although most of them are film types. Most engineering majors and physics majors at UCF don't bother because it's virtually useless for our degree requirements.

    Here's an article from our student newspaper from the fall 2002 semester.

    Strangely, the course number listed in the article is for physical science. I don't know off hand what the real number is. Here's the O-P page from the latest online course catalog.

    Well, finals ended for me yesterday (with my orbital mechanics final) so I'm going to die for 2 weeks until summer semester starts.

    Daniel Davis

    Aerospace Engineering major

    University of Central Florida - Orlando

    --
    Planetes
    "One World, One Web, One Program" - Microsoft Promo Ad
    "Ein Volk, Ein Reich, Ein Fuhrer" - Adolf Hitl
  27. Mention the stupid Space Station in Armageddon by Anonymous Coward · · Score: 2, Insightful

    I thought Armageddon was a pretty good movie up to the point where they took off from earth.

    And then it turned to crap.

    But of everything that happened after that, the worst, in my opinion, was when they docked with the Space Station to refuel.

    Apparently, the director had been told that if you spin the Station, it will create a psuedo-gravity, so you can save money on weightlessness effects.

    Unfortunately, that's all the director knew, because everything else about the Space Station scene displays a total ignorance of physics.

    First, does the Shuttle dock with the center of the Station, where it is standing still?

    No -- the Shuttle latches on to the outside of the spinning ring!

    And does the sudden shift in center-of-gravity throw the Space Station off balance?

    No, because, fortunately for them, they have two Shuttles that can latch on to opposite sides of the Space Station at exactly the same instant!

    So we have two Shuttles approaching the spinning Space Station from opposite directions, on exactly the right trajectory, at exactly the right speed, so they can both latch on in the same fraction of a second, and start spinning around with the Station.

    And does the fact that the full mass of the Shuttle, as it spins around the Station, is now being suspended against gravity (in effect), by just its door and a docking clamp, cause the Shuttle to snap in two?

    No!

    And does the Shuttle attach by its roof, so that the "gravity" will be down to the floor?

    No, it attaches by a side door -- but the "gravity" is still down to the floor!!!

    And do they have to climb ladders to move toward the center of the Station?

    No, walking along straight corriders, sideways to the spinning motion, seems to work just fine.

    If you ask me, that scene is a low point in all of sci-fi movie history. Even the old el-cheapo 50s space movies showed more respect for science.

    1. Re:Mention the stupid Space Station in Armageddon by br0ck · · Score: 2, Informative

      There are a few more bad science moments in Armageddon if you browse through the whole list at MovieMistakes.com.

  28. Armageddon made me physically ill by ArmorFiend · · Score: 2, Insightful

    Were there any physics in that were even kinda correct? I seem to recall the space shuttles bobing and weaving like airplanes through a meteor shower. Uh, there's no AIR in outer space, guys, thus flying with your big engines pointed back makes you go faster and faster and FasterAndFASTER until you die, and you can't use your wings as control surfaces to turn.

    Ah, and when they were stressfully docking with the spinning(!) "mir", there's this shot where you see the docking hatch extend, and its like the shuttle is "orbiting" mir, even before they make contact.

    I'm pretty sure most big meteors aren't shaped like they're designed by an evil asteroid designing picasso. Yep, I'm pretty sure they're usually just oblong balls.

    I'm pretty sure that meteor swarms that have travelled cosmic distances aren't constantly having sub meteors bang into eachother like bumpercars. They got all that out of their system 10,000 years ago.

    The people that made this movie should be hunted down and shot by their highschool physics instructor.

  29. Hollywood Physics by BitwizeGHC · · Score: 2, Funny

    People learning physics better from movies is exactly who most people think they can leap through a plate glass window from an exploding car, submachineguns blazing with no apparent need to reload, ever.

    Physics lessons from Hollywood is like, the exact opposite of what we need.

    --
    N4st0r, trixx0r h0bb1tz0rz! Th3y st0l3 0ur pr3c10uzz!
  30. The Italian Job (spoiler) by menscher · · Score: 2, Informative
    In the opening scenes, they have a safe drop through several floors and land in a boat. Now, I have an interest in security, and I know that safes weigh a lot. Falling several stories down, even if slowed by an impact with each floor, would give that thing enough penetrating power to punch right through any boat. So when I saw the boat speeding off with the safe in the back, I started laughing and telling the person next to me how stupid that was.

    Oh, and yes, IAAP (I Am A Physicist), so really obvious physics stupidities jump out at me. Like sound effects in space....

  31. F=ma by scubacuda · · Score: 3, Funny
    Everything I currently know about F=ma I learned from watching Roadrunner cartoons.

  32. Firefly by SnappingTurtle · · Score: 2, Interesting

    One of the things that impressed me about the TV show "Firefly" was that when something in space blew up it didn't go "boom".

    --
    I've found that my posts don't format quite right w/o a sig.
  33. Why is this news? by Jondo · · Score: 2, Insightful

    This is just like "Math in art", or "History of calculus" courses that fulfil math requirements.

    They're still bloody arts courses.

  34. Cotton-Candy Classes... Put this concept to WORK by AndyChrist · · Score: 2, Insightful

    I'm sure this sort of class isn't WORTHLESS, especially for people who wouldn't learn anything from a more technical science class, or a physics student just looking for a few laughs. I just hope it doesn't satisfy the baccalaureate core requirements at that school.

    Film students should be required to take classes like this. THAT would make it really meaningful.

  35. Tried that for Babylon 5 by Zathras26 · · Score: 2, Informative

    Straczynski wanted to be true (well, mostly true, anyway) to the laws of physics in Babylon 5. When he originally created the show, all scenes taking place in outer space took place in silence. When they did a test showing to interested audiences, there was too much negative reaction -- most notably, a lot of people thought that there had been a problem with the sound production, so Straczynski decided to put the sound back in.

    It's still really cool, though, that his design for the Starfuries is now being adapted by NASA for use in the future.