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Category: Science
Date: 01/29/10 12:06 PM

117 Responses to We Know This NASA Bumper Sticker Is Clever…[Pic]

  1. Profile photo of fancylad
    fancylad Male 30-39
    18942 posts
    January 29, 2010 at 12:06 pm
    Link: We Know This NASA Bumper Sticker Is Clever... - But we`re just not up on our rocket science and astrophysics enough to get the joke. Any geniuses out there?
  2. Profile photo of pui
    pui Female 18-29
    3574 posts
    January 29, 2010 at 12:09 pm
    idgi but I still think it`s awesome, haha!
  3. Profile photo of hypno1
    hypno1 Male 30-39
    69 posts
    January 29, 2010 at 12:11 pm
    Formula for calculating escape velocity.
  4. Profile photo of Mikeado
    Mikeado Male 18-29
    2159 posts
    January 29, 2010 at 12:12 pm
    Surely the joke is just that the formula is really quite complicated?
  5. Profile photo of CrepesOWrath
    CrepesOWrath Male 18-29
    124 posts
    January 29, 2010 at 12:12 pm
    I don`t understand why they are using `x` for multiplication. Mass is not a vector and therefore makes no sense in a cross product! :)
  6. Profile photo of marglark
    marglark Male 13-17
    10 posts
    January 29, 2010 at 12:14 pm
    G = gravitational constant
    m = mass 1 (rocket)
    M = mass 2 (Earth)
    R = radius (distance between the center of earth and the rocket)
    V(esc) = escape velocity

    just sayin`

  7. Profile photo of Maxynator
    Maxynator Male 18-29
    10 posts
    January 29, 2010 at 12:17 pm
    Its vanilla
  8. Profile photo of ADRUNKHOBO
    ADRUNKHOBO Male 18-29
    295 posts
    January 29, 2010 at 12:25 pm
    Likely something like the force of gravity times mass times something divided by radius is equal to the mass times the escape speed squared divided by two. I think.
  9. Profile photo of Xutar
    Xutar Male 13-17
    154 posts
    January 29, 2010 at 12:26 pm
    this equation is dumb, take out the unnecessary "x"s (representing multiplication), divide both sides by m, move the two to the left side, then take the square root of each. Then you`ll have a useful equaiton for calculating escape velocity of a massive body , given gravitational constant (G), mass of the body(M), and distance from center of gravity (G).
  10. Profile photo of greenspark82
    greenspark82 Female 18-29
    365 posts
    January 29, 2010 at 12:29 pm
    Ok I am the only sub-genius here that didn`t get the joke but I misread the headline at first I thought it said NASCAR bumper sticker.
  11. Profile photo of Xutar
    Xutar Male 13-17
    154 posts
    January 29, 2010 at 12:29 pm
    err that last one was supposed to be R, and also the escape SPEED is independant of the escaping objects mass (m), since the velocity will be the same for all masses, with only required force being ifferent.
  12. Profile photo of Afrokmas
    Afrokmas Male 18-29
    97 posts
    January 29, 2010 at 12:30 pm
    yes, it is clever!
  13. Profile photo of CheeseMan1
    CheeseMan1 Male 18-29
    1408 posts
    January 29, 2010 at 12:32 pm
    Using x for multiplication? What is this, 5th grade?
  14. Profile photo of Nidonemo
    Nidonemo Male 18-29
    9308 posts
    January 29, 2010 at 12:47 pm
    "at first I thought it said NASCAR bumper sticker. "

    Oh thank god I`m not the only one. XD

  15. Profile photo of ze_tuna_fish
    ze_tuna_fish Female 13-17
    92 posts
    January 29, 2010 at 12:50 pm
    do want!
  16. Profile photo of mac_n_cheese
    mac_n_cheese Male 13-17
    148 posts
    January 29, 2010 at 12:52 pm
    i feel like such a geek for getting this
    theyre finding escape velocity by substituting e=GmM/r into e= .05mv^2
  17. Profile photo of southernboy
    southernboy Male 13-17
    132 posts
    January 29, 2010 at 1:00 pm
    My 6th Grade Science teacher had one of those
  18. Profile photo of mystery08
    mystery08 Male 18-29
    160 posts
    January 29, 2010 at 1:01 pm
    G=universal gravitational constant
    m=mass of rocket
    M=mass of earth
    R=distance between the two
    GmM/R=gravitational force
    Vesc= Escape velocity

    This equation is used to calculate the escape velocity only accounting for the gravitational attraction between the two objects.

  19. Profile photo of sjaakwortel
    sjaakwortel Male 18-29
    358 posts
    January 29, 2010 at 1:04 pm
    none, its easy.
  20. Profile photo of thelonious
    thelonious Male 40-49
    3286 posts
    January 29, 2010 at 1:08 pm
    Throwing out an equation that nerds in specialized fields use then standing back and patting yourself on the back for something obscure is clever? Got to recalibrate my clever meter I guess
  21. Profile photo of MandyLea
    MandyLea Female 18-29
    247 posts
    January 29, 2010 at 1:09 pm
    Duh idiots!! I totally understand, I just don`t feel like telling you.
  22. Profile photo of cobrakiller
    cobrakiller Male 18-29
    7475 posts
    January 29, 2010 at 1:21 pm
    I understand all of it pretty well, you have to love physics.
  23. Profile photo of mac_n_cheese
    mac_n_cheese Male 13-17
    148 posts
    January 29, 2010 at 1:21 pm
    thelonious its not a specialised equation by any means, it`s taught in high school
  24. Profile photo of kittilia
    kittilia Female 18-29
    500 posts
    January 29, 2010 at 1:32 pm
    thank you, mystery08! we really wanted to know! or at least I did~~ thelonius, your clever meter needs serious recalibration.
  25. Profile photo of Fatninja01
    Fatninja01 Male 30-39
    25420 posts
    January 29, 2010 at 1:44 pm
    This is using the potential energy of a spacecraft/rocket to find escape velocity, This is using the potential energy of a spacecraft/rocket to find escape velocity. Simplify the equation, you get: Escape velocity = sqrt(2GM/R). To solve that, we already have close approximations of G(6.67x10^-11), and for the Earth, its mass and radius. The required escape velocity is rather independent of the mass of the rocket; you have to get it up to that speed, the mass just effects the amount of force required to push it to that speed. So canceling it out of the equation isn`t really a problem.

    The escape velocity of Earth comes to about 11.2 kilometers per second from the surface, assuming you launch perpendicular to the ground.

  26. Profile photo of DiePSPolice
    DiePSPolice Male 30-39
    493 posts
    January 29, 2010 at 1:47 pm
    The bumper sticker is terrible.

    Nobody uses "x"s for multiplication, the "squared" superscript is on the "esc" instead of the whole variable Vesc, and mass is irrelevant for escape velocity.

    Try v = sqrt(2GM/r)

  27. Profile photo of Elle1987
    Elle1987 Female 18-29
    519 posts
    January 29, 2010 at 1:51 pm
    My science teacher used to say that he did not understand the phrase "Its not Rocket Science!" because Rocket Science is apparently quite easy to get your head around...

    Meh.. I still don`t get it..

  28. Profile photo of ProXLaw
    ProXLaw Male 30-39
    122 posts
    January 29, 2010 at 1:51 pm
    This makes me want to kick a nerd in the balls.
  29. Profile photo of Itsumo
    Itsumo Female 18-29
    295 posts
    January 29, 2010 at 1:53 pm
    D: *eye twitch*
  30. Profile photo of LazyMe484
    LazyMe484 Male 18-29
    10441 posts
    January 29, 2010 at 1:57 pm
    Nobody uses "x"s for multiplication, the "squared" superscript is on the "esc" instead of the whole variable Vesc, and mass is irrelevant for escape velocity.

    Try v = sqrt(2GM/r)

    Thank you! Now I get it.

  31. Profile photo of Itsalwysunny
    Itsalwysunny Male 18-29
    1377 posts
    January 29, 2010 at 2:09 pm
    particle motion bulllllllllsheeeeet
  32. Profile photo of thelonious
    thelonious Male 40-49
    3286 posts
    January 29, 2010 at 2:10 pm
    lol, not my high school. I derived larger equations in cal in hs but not something with crap like esc^2
  33. Profile photo of Cajun247
    Cajun247 Male 18-29
    10742 posts
    January 29, 2010 at 2:11 pm
    G = Universal Gravitational constant
    m = Vehicular mass (factor it out)
    M = Planetary mass
    R = Radius of the planet
    Vesc = Escape velocity
  34. Profile photo of obbycomma
    obbycomma Female 18-29
    315 posts
    January 29, 2010 at 2:14 pm
    Something about particle motion maybe? I`m not up on my rocket science. D:
  35. Profile photo of keg74
    keg74 Male 30-39
    411 posts
    January 29, 2010 at 2:22 pm
    Maybe it doesn`t actually mean crap, and that`s part of the joke?
  36. Profile photo of kasabien
    kasabien Male 18-29
    1 post
    January 29, 2010 at 2:32 pm
    it`s referring to the velocity needed for projectile, in that case a space shuttle, escape the earth`s gravitational field
  37. Profile photo of thelonious
    thelonious Male 40-49
    3286 posts
    January 29, 2010 at 2:33 pm
    I think if you turn it upside down it spells `boobies`
  38. Profile photo of propagandi
    propagandi Male 40-49
    726 posts
    January 29, 2010 at 2:48 pm
    I so want one of these.
  39. Profile photo of Thesphinx
    Thesphinx Male 18-29
    353 posts
    January 29, 2010 at 2:49 pm
    GmM/R = mV^2/2

    Where V stands for the escape velocity.

    Essentially, you`re solving for V. The equation can be simplified, however, by dividing m off of both sides and multiplying both sides by 2, leaving you with

    2GM/R = V^2

    From there you can easily take the square root of both sides to leave yourself with V.

    They made this seemingly complicated on purpose.

  40. Profile photo of HarryBalszak
    HarryBalszak Male 40-49
    1590 posts
    January 29, 2010 at 3:04 pm
    Thanks for clearing that up, sphinx.
  41. Profile photo of Angelmassb
    Angelmassb Male 18-29
    15511 posts
    January 29, 2010 at 3:09 pm
    Are you kidding me? all I know is M=ec2
  42. Profile photo of MattPrince
    MattPrince Male 40-49
    2220 posts
    January 29, 2010 at 3:19 pm
    Rocket science is SIMPLE.

    For every action there is an equal and opposite reaction.

    Understand that and you understand rockets.

  43. Profile photo of sumguyin267
    sumguyin267 Male 18-29
    99 posts
    January 29, 2010 at 3:21 pm
    It`s e = mc^2 angel.
  44. Profile photo of flingspoo
    flingspoo Female 18-29
    999 posts
    January 29, 2010 at 3:22 pm
    lol @ boobies
  45. Profile photo of xxPinkxx
    xxPinkxx Female 18-29
    3829 posts
    January 29, 2010 at 3:28 pm
    lol awesome
  46. Profile photo of GlooStikk
    GlooStikk Male 18-29
    1297 posts
    January 29, 2010 at 3:28 pm
    it`s telling you to "shut up and dance!!!"
  47. Profile photo of NitroJunkie
    NitroJunkie Male 70 & Over
    758 posts
    January 29, 2010 at 3:42 pm
    I`ve dealt with tougher equations going through Nuclear Power School in the navy.
    Yep. 1upper.
  48. Profile photo of lgm432
    lgm432 Male 13-17
    172 posts
    January 29, 2010 at 3:46 pm
    Rofl
  49. Profile photo of AAgony
    AAgony Female 13-17
    12 posts
    January 29, 2010 at 4:04 pm
    The answer is 6.
  50. Profile photo of Lionhart2
    Lionhart2 Male 40-49
    8306 posts
    January 29, 2010 at 4:04 pm
    "I`m Still A Virgin" would be easier to understand and say the same thing.
  51. Profile photo of Narninian
    Narninian Male 18-29
    127 posts
    January 29, 2010 at 4:13 pm
    I doubt most employed scientists (smart people) are virgins.
  52. Profile photo of Kanashto
    Kanashto Male 18-29
    499 posts
    January 29, 2010 at 4:15 pm
    this is stupid. you would understand if you know the variables. it`s rhetorically illogical.
  53. Profile photo of Bulky
    Bulky Male 18-29
    34 posts
    January 29, 2010 at 4:43 pm
    `this is stupid. you would understand if you know the variables. it`s rhetorically illogical. `

    You are a fool. If you knew anything about this you would know exactly what those variables are; they are very standard im afraid my uneducated friend. It is merely equating gravitational potential energy to the kinetic energy needed to overcome said energy (ie send a rocket into space)

    I dont think its supposed to be a joke its just a very geeky numberplate

  54. Profile photo of punkipenguin
    punkipenguin Female 18-29
    778 posts
    January 29, 2010 at 4:54 pm
    good one lionhart. ^_^
  55. Profile photo of imghandi
    imghandi Male 18-29
    7 posts
    January 29, 2010 at 4:55 pm
    im fairly certain, it`s an equation that`s used to find orbital speeds, masses, and radii of two gravitating objects in space. basically just newtons second law rewritten to include the motion of a satellite. im a junior in highschool, i dont think its that hard.
  56. Profile photo of cobrakiller
    cobrakiller Male 18-29
    7475 posts
    January 29, 2010 at 5:00 pm
    @lionhart, not so much. most people who use this equation in their profession make a nice sum of money. everyone knows money equals --> =^.^=
  57. Profile photo of SoundlesHero
    SoundlesHero Male 18-29
    62 posts
    January 29, 2010 at 5:07 pm
    I grad with my B.S. in Physics this May. Yay me...

    This is just the escape velocity from a 2nd order differential equation. Pretty boring, actually. Although, I would disagree on this being a common equation. You have probably seen the gravitational potential energy equation 9which is very similar) in lower division physics, but this equation doesn`t usually show up until advanced mechanics. But every prof teaches differently.

    I worked at a National Lab for 5 years. And yes, most of us are def. not virgins. One of the reasons I left the lab is because everyone is sleeping with each other. Like a big giant nerdy f-fest. Pretty crazy.

  58. Profile photo of panth753
    panth753 Female 18-29
    9258 posts
    January 29, 2010 at 5:46 pm
    "I worked at a National Lab for 5 years. And yes, most of us are def. not virgins. One of the reasons I left the lab is because everyone is sleeping with each other. Like a big giant nerdy f-fest. Pretty crazy."

    Nice, in a kind of Big Bang Theory way.

  59. Profile photo of krisley
    krisley Male 18-29
    525 posts
    January 29, 2010 at 6:20 pm
    "I worked at a National Lab for 5 years. And yes, most of us are def. not virgins. One of the reasons I left the lab is because everyone is sleeping with each other. Like a big giant nerdy f-fest. Pretty crazy."

    Nice, in a kind of Big Bang Theory way.

    -Sometimes the comments on IAB are just as funny if not funnier than the actual post... I love this site. "BORED MEMBERS" FTW!!!!!!

  60. Profile photo of Jonas999
    Jonas999 Male 30-39
    78 posts
    January 29, 2010 at 6:43 pm
    Oh don`t worry. Our proud leader essentially just pronounced his intention to destroy the actual space program with budget cuts that add up to 5 dollars a person a year for the overall population. Don`t get me wrong NASA will still exist but we will not be doing much in the way of the ole man in space bit real soon.
  61. Profile photo of billy66bare
    billy66bare Male 18-29
    289 posts
    January 29, 2010 at 7:51 pm
    They`ve been planning to scrap the space program for years...and I believe it was Bush`s doing.

    Funny bumper sticker btw!

  62. Profile photo of Samsonite219
    Samsonite219 Male 18-29
    703 posts
    January 29, 2010 at 8:32 pm
    its really not that hard of an equation
  63. Profile photo of magoo22
    magoo22 Male 30-39
    660 posts
    January 29, 2010 at 8:32 pm
    I once met a female physicist at a party. She got her PhD by researching "remote sensing", whatever that is!
    She was a platinum blonde and she claimed she had a tattoo which read "carpe diem" just below her bikini line.
    Natrually enough, I asked her if the "carpe" matched the curtains, which I thought was hilarious.....she didn`t!
  64. Profile photo of Agent00Smith
    Agent00Smith Male 18-29
    2581 posts
    January 29, 2010 at 8:52 pm
    HA
  65. Profile photo of manorrd
    manorrd Male 30-39
    2372 posts
    January 29, 2010 at 9:15 pm
    @billy66barre.

    EVERYTHING is Bush`s doing. Didn`t you know that? LOL

  66. Profile photo of darkfire99
    darkfire99 Male 18-29
    7 posts
    January 29, 2010 at 9:19 pm
    I looked into it just for kicks. Something to do with using the potential energy of a rocket to find escape velocity. Yeah, I don`t pretend to understand it either.
  67. Profile photo of Stodogs
    Stodogs Female 13-17
    301 posts
    January 29, 2010 at 9:38 pm
    my dad has a pi shirt like that
  68. Profile photo of turbopuppy
    turbopuppy Male 30-39
    158 posts
    January 29, 2010 at 10:48 pm
    Balistics. Trajectory of a projectile. It`s in your freshman physics textbook...
  69. Profile photo of KoalaMeatPie
    KoalaMeatPie Male 18-29
    2578 posts
    January 29, 2010 at 10:52 pm
    In rough, it means finding the escape veolcity for any given mass, for a given gravity.
  70. Profile photo of duffytoler
    duffytoler Male 40-49
    5195 posts
    January 29, 2010 at 10:54 pm
    It`s the energy required for escape velocity. Think of all the names and things about ballplayers and actors you`ve learned over the years. That`s why you don`t have room in your head for things like this.
  71. Profile photo of AwesomeInc
    AwesomeInc Male 18-29
    10 posts
    January 29, 2010 at 11:45 pm
    It`s not the "Trajectory of a Projectile." The equation yields scalar a scalar quantity, while trajectory is a vector.

    duffytoler had it right. Notice the "m" term vanishes, indicating escape velocity is dependent on the mass of the planet, not the mass of the spacecraft or projectile. Fun fact for the evening, I suppose.

  72. Profile photo of Cajun247
    Cajun247 Male 18-29
    10742 posts
    January 30, 2010 at 12:23 am
    All astrophysicists, aeronautical engineers, and astronomers on I-A-B say "AYE!"

    AYE!

  73. Profile photo of Tomz
    Tomz Male 18-29
    55 posts
    January 30, 2010 at 12:37 am
    I would say "AYE!" but I`m still in training.
  74. Profile photo of Lw
    Lw Male 18-29
    13 posts
    January 30, 2010 at 12:55 am
    Looks like Newton`s law of gravity.

    It defines the relative speed of two bodies attracted toward each others by heir gravity.

    So in this context the formula means:
    If you can read this you`re too close you dumbass

  75. Profile photo of ianrogers
    ianrogers Male 13-17
    6 posts
    January 30, 2010 at 2:44 am
    Personally, I don`t understand math too well so I don`t get this joke
  76. Profile photo of razordragon
    razordragon Male 18-29
    336 posts
    January 30, 2010 at 2:55 am
    hahaha. nice one.
  77. Profile photo of MrBored123
    MrBored123 Male 18-29
    52 posts
    January 30, 2010 at 3:32 am
    Hi,

    well the left part of the equation is the gravitational energy it takes to get from 0 to radius R with an object of mass mx away from the mass M. This is the integrated gravitational force -G_x (m_x M)/r^2 from 0 to R. I guess they made a mistake here, because you normally don`t start at 0 but rather at a point with the radius of the mass m (for example the radius of the earth). Although a little extra energy won`t hurt when escaping the Earths pull, I guess that if NASA can`t do any better in math we don`t have to wonder when the space ships crash...

    On the other side we have the kinetic Energy of the mass mx, thus by equating these two energies we get the escape velocity V_ESC it takes the Object of mass mx to escape the gravitational pull to mass M.

    I`m an electrical engineer so this really is not my field, so you can keep any errors :-D.

  78. Profile photo of lukas1051
    lukas1051 Male 18-29
    3426 posts
    January 30, 2010 at 4:28 am
    The answer is 5.
  79. Profile photo of scorpio28
    scorpio28 Female 18-29
    343 posts
    January 30, 2010 at 4:31 am
    Ian you dont have to understand the math lol. People are always saying " what dont you get about (fill in blank)? It`s not rocket science." The equation on the sticker IS actual rocket science lol. Make sense? If you want to understand the actual math, read the comment above yours. :)
  80. Profile photo of scorpio28
    scorpio28 Female 18-29
    343 posts
    January 30, 2010 at 4:32 am
    Ahem. Sorry Ian. Read MR.BORED`s comment, my mistake. :)
  81. Profile photo of TKD_Master
    TKD_Master Male 18-29
    4794 posts
    January 30, 2010 at 5:50 am
    actually the answer is about eleven. or about seven, depending if they want the answer in km/s or miles/second.
  82. Profile photo of Pieroe
    Pieroe Male 18-29
    4 posts
    January 30, 2010 at 5:52 am
    Almost AYE! damn you college taking to long.
  83. Profile photo of princess0764
    princess0764 Female 13-17
    175 posts
    January 30, 2010 at 6:02 am
    gravity times mass times mass divided by rocket equals mass times volume esc squared divided by two
  84. Profile photo of princess0764
    princess0764 Female 13-17
    175 posts
    January 30, 2010 at 6:02 am
    i think
  85. Profile photo of SamVimes
    SamVimes Male 30-39
    619 posts
    January 30, 2010 at 7:04 am
    I play poker with a guy who works as a rocket scientist for NASA. Whenever he is taking too long to make a decision, we`ll say, "Come on Dave - It`s not rocket science."

    That joke never gets old.

  86. Profile photo of Ninja-Nerd
    Ninja-Nerd Male 18-29
    139 posts
    January 30, 2010 at 7:29 am
    This is in reference to the Escape Speed(velocity) required to "escape" from a gravitational field (such as Earth)... I remember doing work with this kind of calculation, and having to use the Schwarzchild radius for singularities...

    Year 12 Astrophysics right there.

  87. Profile photo of METALLICAROX
    METALLICAROX Male 18-29
    324 posts
    January 30, 2010 at 7:50 am
    It means "piss me off and I`m launchin` a rocket up your @$$"
  88. Profile photo of router52000
    router52000 Male 18-29
    613 posts
    January 30, 2010 at 8:03 am
    But I do understand.
  89. Profile photo of Spider_sol
    Spider_sol Male 18-29
    1452 posts
    January 30, 2010 at 9:42 am
    This one is much better than the red one that says "If this bumper sticker turns blue you`re going too fast" because that was is actually not physically true.
  90. Profile photo of nerdtchn
    nerdtchn Male 13-17
    64 posts
    January 30, 2010 at 10:58 am
    @Spider_sol:
    It`s called "phase shifting" and it`s totally physically true. You`d just have to be going extremely fast.
  91. Profile photo of alchemist18
    alchemist18 Female 13-17
    356 posts
    January 30, 2010 at 10:59 am
    It equals 12n...duhh
  92. Profile photo of BlankTom
    BlankTom Male 30-39
    1674 posts
    January 30, 2010 at 11:01 am
    The parts I don`t understand are the "x" symbol. It makes it looks more like their adding another variable instead of multiplying the parameters together.

    Also V(esc)^2 looks like their squaring the subscript and not the parameter itself.

  93. Profile photo of DIETY
    DIETY Male 13-17
    196 posts
    January 30, 2010 at 11:52 am
    It`s the velocity at which rockets can leave the atmosphere, or escape velocity. I don`t really understand how that`s a joke. Probably to confuse people who haven`t taken physics.
  94. Profile photo of cman7721
    cman7721 Male 18-29
    618 posts
    January 30, 2010 at 1:32 pm
    if this guy is a rocket scientist, he should know better than to by a grand am gt AMIRIGHT!?? ...no?
  95. Profile photo of LaChanteuse
    LaChanteuse Female 18-29
    77 posts
    January 30, 2010 at 4:59 pm
    @DIETY:
    The "x" is "times"
  96. Profile photo of srgkoala
    srgkoala Male 18-29
    299 posts
    January 30, 2010 at 5:25 pm
    It`s basically saying you`re going to fast and approaching the escape speed of the earth
  97. Profile photo of strech2k
    strech2k Male 18-29
    83 posts
    January 30, 2010 at 5:46 pm
    i want that for ma car
  98. Profile photo of SoundlesHero
    SoundlesHero Male 18-29
    62 posts
    January 30, 2010 at 5:51 pm
    "...and she claimed she had a tattoo which read "carpe diem" just below her bikini line.
    Natrually enough, I asked her if the "carpe" matched the curtains, which I thought was hilarious.....she didn`t!"

    Hahahaha! Although most might say that`s a fail, my inner nerd says this is a WIN.

    Oh and all US government facilities buy American cars. Which includes the Pontiac GT. At LLNL and LBNL, the directorate usually drive Chrysler 300`s and Cadillac STS`s. My car was a Ford Crown Vic P71. And those are your tax dollars at work, folks!

  99. Profile photo of Lionhart2
    Lionhart2 Male 40-49
    8306 posts
    January 30, 2010 at 6:56 pm
    > MrBored123
    > Hi, well the left part of the equation is the gravitational energy it takes to get from 0 to radius R with an object of mass mx away from the mass M. This is the integrated gravitational force -G_x (m_x M)/r^2 from 0 to R...

    Your IQ is too high for i-am-bored. Perhaps you`d be happier over at 4chan...

    Nah only kidding dude.

  100. Profile photo of catbarf
    catbarf Male 18-29
    1455 posts
    January 30, 2010 at 7:46 pm
    Basically, gravity is `negative` energy, in the sense that if you are in a gravity well, your gravitational potential energy is negative. The best you can get is 0.

    So basically, if you add positive kinetic energy (i.e. speed away from the planet) to your gravitational potential energy, it eventually becomes 0, and you escape the gravity well. The speed necessary for this is escape velocity.

    So, since you`re saying:

    gravitational potential energy + kinetic energy = 0

    You are really saying:

    -gravitational potential energy = kinetic energy

    And therefore, you substitute in 1/2mv^2 for kinetic energy and GmM/R for gravitational potential energy, and end up with a wonderful equation for calculating escape velocity on any given planet.

  101. Profile photo of catbarf
    catbarf Male 18-29
    1455 posts
    January 30, 2010 at 7:46 pm

    Rocket science isn`t difficult. There`s minimal friction, predictable behaviors, and a lot of it can be solved through energy equations and a minimum of calculus. No air to worry about, or kinetic friction, or rotational inertia, just objects in space.

    Rocket engineering on the other hand is a godawful nightmare I do not want anything to do with.

  102. Profile photo of Lionhart2
    Lionhart2 Male 40-49
    8306 posts
    January 30, 2010 at 9:19 pm
    > catbarf
    > Rocket science isn`t difficult. No air to worry about, or kinetic friction, or rotational inertia, just objects in space

    On the other hand, EVERY atom in the universe exerts a gravitational force upon every OTHER atom in the universe, which would tend to make it a little more difficult if they didn`t just cheat and discount 99.9999999% of them as being `too weak to bother with`.

  103. Profile photo of vicious_liar
    vicious_liar Male 13-17
    1226 posts
    January 31, 2010 at 1:59 am
    lol @ lionhart. Didn`t you know that`s how physicists like to work?
  104. Profile photo of screwzlooose
    screwzlooose Male 30-39
    385 posts
    January 31, 2010 at 5:58 am
    it`s the "escape velocity" equation. .if it is still being wondered about.
  105. Profile photo of steve41high
    steve41high Male 18-29
    1153 posts
    January 31, 2010 at 8:12 am
    woah woah! hold it a second. i come on iab to procrastinate and get away from work. not to learn rocket science
  106. Profile photo of howlingwolf
    howlingwolf Male 18-29
    1351 posts
    January 31, 2010 at 8:35 am
    Gravitational Potential Energy?=Kinetic Energy Rocket science-no. 9th grade physics class-yes.
  107. Profile photo of Hammersley19
    Hammersley19 Male 18-29
    12 posts
    January 31, 2010 at 10:38 am
    How about a bit of the old multistage rocket equation in a gravitational field.

    delta v = SUM u*Ln(Mi/Mf) - g*t*Cos(theta)

    I is smaller than 3, the function of modulus 5 x

  108. Profile photo of Spider_sol
    Spider_sol Male 18-29
    1452 posts
    February 1, 2010 at 12:43 pm
    "@Spider_sol:
    It`s called "phase shifting" and it`s totally physically true. You`d just have to be going extremely fast."

    @nerdtchn: I know phase shifting and I get red shift/blue shift... obviously better than you. Red wouldn`t turn blue, it would shift blue. It would become a slightly oranger color of red.

  109. Profile photo of robosnitz
    robosnitz Male 40-49
    2737 posts
    February 1, 2010 at 7:44 pm
    I have enough trouble flushing the toilet,...what the hell is this alien language?
  110. Profile photo of unbanned
    unbanned Male 13-17
    999 posts
    February 1, 2010 at 8:37 pm
    nerds!
  111. Profile photo of Asakura
    Asakura Female 18-29
    236 posts
    February 3, 2010 at 6:59 am
    I have a shirt that says that
  112. Profile photo of Sahjan
    Sahjan Female 13-17
    213 posts
    February 5, 2010 at 3:20 pm
    i iz not understand dis crud.
  113. Profile photo of xclr82xtc
    xclr82xtc Male 18-29
    2 posts
    February 8, 2010 at 2:35 am
    that equation is not right..divide both sides by X
  114. Profile photo of Pyroo
    Pyroo Male 18-29
    108 posts
    February 12, 2010 at 5:55 pm
    xclr82xtc: Like you know what you`re talking about. HE.HE.HE.
  115. Profile photo of cernunnos
    cernunnos Male 18-29
    1 post
    February 15, 2010 at 7:29 am
    Ok so G is a constant of proportionality for gravitational pulls between 2 bodies (universal gravitation constant), M and m are the masses of the 2 bodies, R i would assume is the distance between the 2 bodies.

    The other side of the equation seems to contain the mass of 1 body and its velocity, so i would assume this equation is what u need to solve in order to put a satelite in a stable orbit around the earth, or maybe to calculate wich distances from the earth can be used as stable orbits for satelites.

    or something like that :D

  116. Profile photo of atrin00azn
    atrin00azn Male 13-17
    6 posts
    February 20, 2010 at 4:57 pm
    GxmxM/R you can rewrite that as
    Gx^2mM/R (that is x squared
  117. Profile photo of Swarook
    Swarook Male 18-29
    22 posts
    September 7, 2014 at 6:11 am
    This is about escape velocity. (Vesc squared)

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