# We Know This NASA Bumper Sticker Is Clever...[Pic]

Submitted by: fancylad 7 years ago in
224

But we"re just not up on our rocket science and astrophysics enough to get the joke. Any geniuses out there?
224
Male 22
This is about escape velocity. (Vesc squared)
Male 6
GxmxM/R you can rewrite that as
Gx^2mM/R (that is x squared
Male 1
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

Male 108
xclr82xtc: Like you know what you`re talking about. HE.HE.HE.
Male 2
that equation is not right..divide both sides by X
Female 213
i iz not understand dis crud.
Female 236
I have a shirt that says that
Male 999
nerds!
Male 2,737
I have enough trouble flushing the toilet,...what the hell is this alien language?
Male 1,451
"@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.

Male 12
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

Male 1,351
Gravitational Potential Energy?=Kinetic Energy Rocket science-no. 9th grade physics class-yes.
Male 1,153
woah woah! hold it a second. i come on iab to procrastinate and get away from work. not to learn rocket science
Male 384
it`s the "escape velocity" equation. .if it is still being wondered about.
Male 1,226
lol @ lionhart. Didn`t you know that`s how physicists like to work?
Male 8,302
> 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`.

Male 1,455

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.

Male 1,455
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.

Male 8,302
> 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...

[quote]Nah only kidding dude.[/quote]

Male 62
"...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!

Male 83
i want that for ma car
Male 299
It`s basically saying you`re going to fast and approaching the escape speed of the earth
Female 77
@DIETY:
The "x" is "times"
Male 617
if this guy is a rocket scientist, he should know better than to by a grand am gt AMIRIGHT!?? ...no?
Male 196
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.
Male 1,674
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.

Female 356
It equals 12n...duhh
Male 64
@Spider_sol:
It`s called "phase shifting" and it`s totally physically true. You`d just have to be going extremely fast.
Male 1,451
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.
Male 612
But I do understand.
Male 324
It means "piss me off and I`m launchin` a rocket up your @\$\$"
Male 139
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.

Male 619
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.

Female 175
i think
Female 175
gravity times mass times mass divided by rocket equals mass times volume esc squared divided by two
Male 4
Almost AYE! damn you college taking to long.
Male 4,793
Female 343
Ahem. Sorry Ian. Read MR.BORED`s comment, my mistake. :)
Female 343
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. :)
Male 3,425
Male 52
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.

Male 336
hahaha. nice one.
Male 6
Personally, I don`t understand math too well so I don`t get this joke
Male 13
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

Male 55
I would say "AYE!" but I`m still in training.
Male 10,855
All astrophysicists, aeronautical engineers, and astronomers on I-A-B say "AYE!"

AYE!

Male 10
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.

Male 5,194
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.
Male 2,576
In rough, it means finding the escape veolcity for any given mass, for a given gravity.
Male 158
Balistics. Trajectory of a projectile. It`s in your freshman physics textbook...
Female 301
my dad has a pi shirt like that
Male 7
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.
Male 2,372
@billy66barre.

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

Male 2,579
HA
Male 660
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!
Male 703
its really not that hard of an equation
Male 289
They`ve been planning to scrap the space program for years...and I believe it was Bush`s doing.

Funny bumper sticker btw!

Male 78
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.
Male 526
"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!!!!!!

Female 9,478
"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.

Male 62
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.

Male 7,611
@lionhart, not so much. most people who use this equation in their profession make a nice sum of money. everyone knows money equals --> =^.^=
Male 7
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.
Female 778
good one lionhart. ^_^
Male 34
`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

Male 497
this is stupid. you would understand if you know the variables. it`s rhetorically illogical.
Male 127
I doubt most employed scientists (smart people) are virgins.
Male 8,302
"I`m Still A Virgin" would be easier to understand and say the same thing.
Female 12
Male 172
Rofl
Male 758
I`ve dealt with tougher equations going through Nuclear Power School in the navy.
Yep. 1upper.
Male 1,297
it`s telling you to "shut up and dance!!!"
Female 3,828
lol awesome
Female 999
lol @ boobies
Male 99
It`s e = mc^2 angel.
Male 2,220
Rocket science is SIMPLE.

For every action there is an equal and opposite reaction.

Understand that and you understand rockets.

Male 15,510
Are you kidding me? all I know is M=ec2
Male 1,590
Thanks for clearing that up, sphinx.
Male 352
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.

Male 725
I so want one of these.
Male 3,310
I think if you turn it upside down it spells `boobies`
Male 1
it`s referring to the velocity needed for projectile, in that case a space shuttle, escape the earth`s gravitational field
Male 410
Maybe it doesn`t actually mean crap, and that`s part of the joke?
Female 315
Something about particle motion maybe? I`m not up on my rocket science. D:
Male 10,855
G = Universal Gravitational constant
m = Vehicular mass (factor it out)
M = Planetary mass
R = Radius of the planet
Vesc = Escape velocity
Male 3,310
lol, not my high school. I derived larger equations in cal in hs but not something with crap like esc^2
Male 1,375
particle motion bulllllllllsheeeeet
Male 10,440
[quote] 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) [/quote]

Thank you! Now I get it.

Female 295
D: *eye twitch*
Male 122
This makes me want to kick a nerd in the balls.
Female 519
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..

Male 493
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)

Male 25,416
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.

Female 500
thank you, mystery08! we really wanted to know! or at least I did~~ thelonius, your clever meter needs serious recalibration.
Male 148
thelonious its not a specialised equation by any means, it`s taught in high school
Male 7,611
I understand all of it pretty well, you have to love physics.
Female 247
Duh idiots!! I totally understand, I just don`t feel like telling you.
Male 3,310
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
Male 358
none, its easy.
Male 160
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.

Male 132
Male 148
i feel like such a geek for getting this
theyre finding escape velocity by substituting e=GmM/r into e= .05mv^2
Female 92
do want!
Male 9,306
"at first I thought it said NASCAR bumper sticker. "

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

Male 1,406
Using x for multiplication? What is this, 5th grade?
Male 97
yes, it is clever!
Male 154
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.
Female 365
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.
Male 154
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).
Male 295
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.
Male 10
Its vanilla
Male 10
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`

Male 124
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! :)
Male 2,159
Surely the joke is just that the formula is really quite complicated?
Male 69
Formula for calculating escape velocity.
Female 3,574
idgi but I still think it`s awesome, haha!
Male 20,196
Link: We Know This NASA Bumper Sticker Is Clever...[Pic] [Rate Link] - But we`re just not up on our rocket science and astrophysics enough to get the joke. Any geniuses out there?