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/sci/ - Science & Math

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4863265 No.4863265 [Reply] [Original]

If you drill a giant hole which crosses an entire planet and jump inside, would you reach the other side?
Or would you float in mid air in the center of the planet?

>> No.4863269

Wind resistance would prevent you from reaching the other side. You would oscillate back and forth and eventually settle in the center.

>> No.4863272

You would probably reach the other side, because the momentum in the beginning would be equal to the energy you need to get up in the second part. (minus friction)
You could go through the earth in about 40 minutes (if there could be constructed an appropriate tunnel)

>> No.4863717

Assuming you have something for the heat, and movement of the core, would the air pressure or magnetic fields injure the tunnelnaut? Of you eliminated the air problem, would the magnetic problem persist? Vice-versa?

>> No.4863719

Read the short story, The Tachypomp. It's pretty good.

>> No.4863723 [DELETED] 

if you're trapped in the center do you get crushed by the gravity even though you're floating in mid-air?

>> No.4863727

>>4863265
It depends on the density of the fluid which fills the hole.
If you were to seal the tunnel off and make it a near-perfect vacuum, then yes you would reach the other side, provided you wore a spacesuit.

>> No.4863730

>>4863723

Hey, I (>>4863717) got here first.

But yeah, would just the forces from gravity be dangerous?

>> No.4863739
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4863739

I'm assuming there is some sort of atmosphere which would cause you to fall at maximum velocity meaning you would eventually reach the center and then keep going for another 100 feet before falling back to the center.

If there isn't an atmosphere I would say that you would fly through and onto the other side but because of gravity you would come to a complete stop at point B rather than continue flying through space with spaghetti flying out of your pockets propelled by noxious gas emitting from your anus.

>> No.4863746

>>4863723
Why would you?
Gravity is not magic.
It is not at the center of the earth just "because".
The center of the earth is the center of the earth because of gravity. Not the other way around.
In other words, no. You wouldn't be floating in midair either.
You would be walking along the sides of your hole when you got to the center.

>> No.4863743 [DELETED] 

air pressure would kill you

i'm not gonna do the math but you would die

>> No.4863747

>>4863723
There is no gravity in the center.

>> No.4863753

>>4863746
seems legit

the outer parts of the earth would be pulling you back

>> No.4863759

(6.67*10^-11)*(5.972*10^24)*59 = 2.35*10^16

Something like that would be the forces pulling on you from all directions.

>> No.4863762

>>4863759 here

p.s. I'm talking out my ass

>> No.4863767

>>4863759 & >>4863762 here

Would the forces all cancel out?

>> No.4863784

you would fall directly downward (relative to the ground at that moment) until eventually you reached the same point on the other end. as soon as you jumped, you would experience the downward slope of mechanical energy which would (for you) basically be the equivalent of a modified hooke's law. you would oscillate repeatedly until all of your kinetic energy is transferred into potential, at which point you would sit at this hypothetical core (which, btw, the g would be enormous) that apparently has no temperature (or no effect on you whatsoever for that matter) forever.

>>4863759
no units = no care

>> No.4863785

Something would occur called a "Gravitational Well". You'd step in to the hole, fall through to the other side of the planet (assuming the center of the Earth was hollow), gravity would then slowly begin to pull you back in to the hole.

Gravity is a very weak force, especially the gravitational pull of our tiny planet. Hence, there would not be enough gravity to pull someone apart while they remain stationary in the center of the Earth (that is a myth). You would nor remain there, for you'd always have some momentum while passing the 'center point' each time (starting from the initial step and fall in to the hole).

>> No.4863798

This would be the best skydiving

>> No.4863800

>>4863785
What if you grabbed the side of the hole to slow your movement?

>> No.4863804
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4863804

question: why don't we drill a hole through as shown in the pic and then shove a spaceship through it so it gains massive speed and then turn on the rockets near the exit, and use this as a means to send space equipment even further away?

>> No.4863807

>>4863798
No.
It would be like jumping off the side of an angled mountain side with a parachute.
Eventually you would hit the side, with a significant velocity.

>> No.4863808

>>4863804
The cost of drilling that hole would be enormous.

>> No.4863809

>>4863808
would the savings in all the upcoming launches not be worth it?

>> No.4863810

>>4863804
Because it would wind up crashing, assuming you don't aim it away from the earth's core.

>> No.4863812

>>4863804
Because mantle

>> No.4863813

Not within the lifetime of any politician with the power to okay its construction.

>> No.4863814

>>4863810
the technical details could be figured out and accounted for... is there something about this that makes it impossible though?

>> No.4863818

>>4863814
Given hitherto unseen technological power, I guess it could be built. But that doesn't mean it will ever be possible for us to have that power.

>> No.4863819

>>4863804
Because that would be inefficient, expensive as fuck and silly.

>> No.4863822

>>4863804
We could use a giant circular electromagnetic tube to hold the ship in place along it's entire journey through the Earth with zero friction.

>> No.4863823

>>4863819
silly, yes... inefficient? based on what?

>> No.4863831

>>4863804
Once the hole is built, this can be used as a cheap and fast way to transport material from one side of the globe to the other

>> No.4863834

>>4863831
>We break even in 180 years!

>> No.4863839

>>4863804
What everyone else said... but also because it wouldn't work.

>> No.4863840

>>4863831
Soon earth is swiss cheese.

>> No.4863845
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4863845

>>4863823
Based on all the shit it would take to keep that spaceship going straight inside a tunnel, not to mention all the wasted energy etc spent moving through it.
It wouldn't just fall.
About a third of the way in it would be affected by gravity as if it was on the surface, meaning that if you dropped the ship in nose first it would be horizontally aligned with the gravity of the planet at the halfway point but it would have to carry it's own weight in upward thrust long before that.
So, inefficient.
You'd have better luck with a raised rail on the outside of the planet, relying on centrifugal force to create som upward momentum.

>> No.4863846

God dammit it'snot the cost that's the problem, it's the earthquakes, movement of mantle and plates, temperature, and mole people/fairies/whatever.

>> No.4863850
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4863850

>>4863823
Easier to do this.

>> No.4863855

>>4863846
>12 dollars at six flags

>> No.4863856
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4863856

>>4863846
Yes, there are multiple factors to consider, no doubt.
Fairies always try to fuck with science. Just ask cern.

>> No.4863857
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4863857

>>4863839
>it's not going to work because it's not going to work

A lot of resources would be acquired from this!

Can this hole not also be extended to be used as a dump for our wastes?

>> No.4863862

>>4863857
Our time would be better spent researching recyclable materials.

>> No.4863864

>>4863857
>see: 'The Core', directed by Jon Amiel

>> No.4863869
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4863869

>>4863804
>enhance space travel
>solve waste disposal
>stimulate economy: transport
>awesome
>infinite possibilities!
>physics experiments

why haven't we funded this yet?

>> No.4863878

>>4863804
there's a thing called gravitational slingshot that is much more efficient and cost-effective

>> No.4863883

>>4863804

The stuff dropped into a hole would slow during the second half of the tunnel and emerge from the other side at no speed. That hole would accomplish nothing. You can't use Earth's gravity to get away from Earth.

>> No.4863889
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4863889

>>4863883
Yes you can, just not like that.
>Mfw higgs field actuator

>> No.4863905

>>4863804
Not this guy, but I want to make a modification.

What if halfway through, the tube turns/curves until it reaches perpendicular with the tangent of that point it's pointing at. Would that fix things?

>> No.4863923

>>4863905
What if we make sure the exit is pointing towards the moon, or the sun, for more gravitational pull on the other end?

>> No.4863926

>>4863905
You mean something like this? (The blue line)
If so then I don't see how that would make things better.
It would actually make it worse as it would now have to provide even more thrust than before.
And by the time it got to the other end would be going straight up but from further down so even that last part alone serves as proof that it would be better for everyone to just do a regular launch.

>> No.4863929
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4863929

>>4863926
Forgot the picture.

>> No.4863954

if there was a ladder going from one side of earth to the other the middle would be totally effortless to move either way but as you move away from the center the more difficult it becomes to move, but not that difficult, you already used a ladder before.

>> No.4863964

>>4863929
>>4863929
No. Halfway down the red line, draw a red line going 90 degrees to thr right.

>> No.4863969

>>4863964
That would definitely not work. Why would you even ask that?

>> No.4863996

>>4863969
Fuck I don't know, throwing ideas at the wall and seeing what sticks?

>> No.4864377

>>4863855
Hah

>> No.4864408

GUYS WHAT IF INSTEAD OF DOING THINGS THAT MAKE SENSE TO GET INTO SPACE, WE JUST TIED LIKE A BILLION STRINGS TO OUR SATELLITES. THEN, WE MAKE A BIG-ASS SCIENCE OUT OF DIAMOND (THE HARDEST METAL) KITE AND TIE THAT TO THE SATELLITE.
THEN WE GIVE A STRING TO EVERY PERSON IN CHINA AND HAVE THEM ALL RUN IN THE SAME DIRECTION AT ONCE.

IT WOULD FLY GUYS. THE SPACE-KITE WOULD..

GUYS?

GUYS???

guys?...

>> No.4864422

>>4864408
It's not a stupid question it's a physics problem. Newton once considered this idea.

>> No.4864429

well probably not since once you reach the hollow center where the lizard people live one of them will be mad at you for drilling a whole and they'll nab ya

>> No.4864430

>>4864422
the hole through the earth is a physics problem and a very interesting one, as there's no one answer that makes perfect sense and it's impossible to simulate properly.

but the notion that a hole drilled through the earth can be used to launch a spacecraft is insane.

>> No.4864982

Seeing as the center of the earth is approx. 9,800 °F you would vaporize before you passed through. Assuming air pressure down there doesn't rip you apart.

>notevenaphysics.jpg

>> No.4866176

Anything falling through a tunnel drilled between any two points on Earth will perform oscillatory motion (harmonic if we assume constant density for Earth, damped if we also take drag and friction into account).

/thread