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Posted: 2/24/2016 9:58:41 PM EDT
Without looking it up, ponder this question:

If a hole was drilled through the earths axis (from north to south) and you then dropped a ball in the northern hole, what would happen? Forget about temperature in this exercise. Gravitational force would pull the ball down. But as it pass through the earths core what happens? Does the ball become suspended or does it continue to fall thus shooting the ball out  the opposing southern hole?
Link Posted: 2/24/2016 9:59:43 PM EDT
[Last Edit: 2/24/2016 10:01:42 PM EDT by kronus92]
Is it on a treadmill?

ETA: On a serious note, I would imagine that the ball would have obtained a significant amount of velocity falling that distance. However, it wouldn't be enough to push it through to the other side of the earth. The cycle would repeat until the ball ran out of energy and remained in the core.
Link Posted: 2/24/2016 10:00:08 PM EDT
Originally Posted By j_hooker:
Without looking it up, ponder this question:

If a hole was drilled through the earths axis (from north to south) and you then dropped a ball in the northern hole, what would happen? Forget about temperature in this exercise. Gravitational force would pull the ball down. But as it pass through the earths core what happens? Does the ball become suspended or does it continue to fall thus shooting the ball out  the opposing southern hole?
View Quote



physical or magnetic north to south?
what direction is the treadmill going?
Link Posted: 2/24/2016 10:00:11 PM EDT
[Last Edit: 2/24/2016 10:01:12 PM EDT by MrTinkels]
Is the earth on a treadmill?

Edit dammit
Link Posted: 2/24/2016 10:01:54 PM EDT
[Last Edit: 2/24/2016 10:16:21 PM EDT by MadMonkey]
ETA: Sorry, I was thinking of a hollow sphere for some reason. Nevermind

Link Posted: 2/24/2016 10:01:57 PM EDT
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Originally Posted By MrTinkels:
Is the earth on a treadmill?

Edit dammit
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No, the Earth is on turtles.

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Link Posted: 2/24/2016 10:04:01 PM EDT
The ball would oscillate with an attenuating amplitude until settling at the center.
Link Posted: 2/24/2016 10:04:39 PM EDT
I'm going with, it will oscillate back and forth through the hole until it gives up all of its energy and eventually coming to a stop at the core.
Link Posted: 2/24/2016 10:04:53 PM EDT
The Devil will catch it in Hell.
Link Posted: 2/24/2016 10:05:14 PM EDT
[Last Edit: 2/24/2016 10:15:39 PM EDT by jerrwhy01]
It actually travels all the way thru to the exact height from which it was dropped. So if it was dropped from five feet above the hole, it'll travel to the other side and come out the hole and achieve an altitude of 5 feet. At least that was according to what I remember watching some science program about speed and gravity.


ETA: Here's a link detailing the physics of it. http://hyperphysics.phy-astr.gsu.edu/hbase/mechanics/earthole.html

and a simpleton NPR explanation: http://www.npr.org/templates/story/story.php?storyId=211434213
Link Posted: 2/24/2016 10:05:28 PM EDT

Originally Posted By j_hooker:


Without looking it up, ponder this question:



If a hole was drilled through the earths axis (from north to south) and you then dropped a ball in the northern hole, what would happen? Forget about temperature in this exercise. Gravitational force would pull the ball down. But as it pass through the earths core what happens? Does the ball become suspended or does it continue to fall thus shooting the ball out  the opposing southern hole?
View Quote
... For the uneducated, questions like these, come at a price you typically don't find on free architecture, open forums

 
Link Posted: 2/24/2016 10:05:54 PM EDT
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Originally Posted By Molotov357:
The ball would oscillate with an attenuating amplitude until settling at the center.
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Unless there are magnets, then all bets are off.
Link Posted: 2/24/2016 10:06:29 PM EDT
I'm gonna go with it slowing as it falls farther towards the center and stopping IF the Earth somehow has retained its internal mass. If there were no mass in its center there would be little gravity anyway, like the moon, which has no molten iron/nickel core.

But I could be wrong.
Link Posted: 2/24/2016 10:08:15 PM EDT
What is the terminal velocity of the ball.
Link Posted: 2/24/2016 10:08:19 PM EDT
air resistance.  Terminal velocity would be lowered to zero as it approached the center of the earth.
Link Posted: 2/24/2016 10:09:38 PM EDT
Guess the old f=ma comes into play. Accelerates to the center poi t or hits terminal velocity and then as it passes the center line (hypothetical) it would be pulled back to the center. Probably bounce back and forth a few times until it came to rest at the center.

Not exactly best description, but that's how I would guess it would work. Unfortunately I didn't sleep at a holiday Inn last night.
Link Posted: 2/24/2016 10:11:21 PM EDT
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Originally Posted By jimhoff:
air resistance.  Terminal velocity would be lowered to zero as it approached the center of the earth.
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I was thinking something like that.  Gravity's rate of acceleration begins reducing as soon as it is below ground and goes all the way to zero as the ball gets closer to the center.
Link Posted: 2/24/2016 10:11:30 PM EDT
[Last Edit: 2/24/2016 10:16:20 PM EDT by j_hooker]
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Originally Posted By YourAlterEgo:
What is the terminal velocity of the ball.
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Calculations show 28000 km/h and reaches this at the center of the earth
Link Posted: 2/24/2016 10:12:01 PM EDT
Originally Posted By j_hooker:
Without looking it up, ponder this question:

If a hole was drilled through the earths axis (from north to south) and you then dropped a ball in the northern hole, what would happen? Forget about temperature in this exercise. Gravitational force would pull the ball down. But as it pass through the earths core what happens? Does the ball become suspended or does it continue to fall thus shooting the ball out  the opposing southern hole?
View Quote

Sorry, not to be a nerd, but this is only a way to start a 'funny', right?
Link Posted: 2/24/2016 10:12:19 PM EDT
unless the holes were funnel-shaped, it would very quickly smash into the side due to conservation of angular momentum.

Link Posted: 2/24/2016 10:12:30 PM EDT
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Originally Posted By Strats:


No, the Earth is on turtles.

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Originally Posted By Strats:
Originally Posted By MrTinkels:
Is the earth on a treadmill?

Edit dammit


No, the Earth is on turtles.

Posted Via AR15.Com Mobile

Turtle Power!
Link Posted: 2/24/2016 10:14:13 PM EDT
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Originally Posted By LowBeta:
unless the holes were funnel-shaped, it would very quickly smash into the side due to conservation of angular momentum.

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That too.  Perhaps assuming the earth is standing still would help this problem.
Link Posted: 2/24/2016 10:14:16 PM EDT
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Originally Posted By Dirtydog:

Sorry, not to be a nerd, but this is only a way to start a 'funny', right?
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Originally Posted By Dirtydog:
Originally Posted By j_hooker:
Without looking it up, ponder this question:

If a hole was drilled through the earths axis (from north to south) and you then dropped a ball in the northern hole, what would happen? Forget about temperature in this exercise. Gravitational force would pull the ball down. But as it pass through the earths core what happens? Does the ball become suspended or does it continue to fall thus shooting the ball out  the opposing southern hole?

Sorry, not to be a nerd, but this is only a way to start a 'funny', right?

Not at all, it's a true physics question.
Link Posted: 2/24/2016 10:15:32 PM EDT
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Originally Posted By Molotov357:
The ball would oscillate with an attenuating amplitude until settling at the center.
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Link Posted: 2/24/2016 10:16:29 PM EDT
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Originally Posted By j_hooker:

Not at all, it's a true physics question.
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Originally Posted By j_hooker:
Originally Posted By Dirtydog:
Originally Posted By j_hooker:
Without looking it up, ponder this question:

If a hole was drilled through the earths axis (from north to south) and you then dropped a ball in the northern hole, what would happen? Forget about temperature in this exercise. Gravitational force would pull the ball down. But as it pass through the earths core what happens? Does the ball become suspended or does it continue to fall thus shooting the ball out  the opposing southern hole?

Sorry, not to be a nerd, but this is only a way to start a 'funny', right?

Not at all, it's a true physics question.


I like the question. In for the answer.
Link Posted: 2/24/2016 10:16:52 PM EDT
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Originally Posted By Rickesis:

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Originally Posted By Rickesis:
Originally Posted By Molotov357:
The ball would oscillate with an attenuating amplitude until settling at the center.


Would it settle?
Link Posted: 2/24/2016 10:17:02 PM EDT

Originally Posted By j_hooker:


Without looking it up, ponder this question:



If a hole was drilled through the earths axis (from north to south) and you then dropped a ball in the northern hole, what would happen? Forget about temperature in this exercise. Gravitational force would pull the ball down. But as it pass through the earths core what happens? Does the ball become suspended or does it continue to fall thus shooting the ball out  the opposing southern hole?
View Quote
this is basically what a comet does.

 



Ball would accelerate faster and faster as it approached the center.  Then as soon as it passed the center it would slow down, but it would have picked up so much speed that it would take a long time to slow down.  It would stop at the south pole and then start dropping back towards the center.  Assuming no air resistance or other outside forces, it would continue to travel north to south, then back south to north.




Comet same thing, sun pulls it closer and closer faster and faster util it loops past the sun and starts going away, at a high speed but slowing down a tiny bit.  It goes out further and further slower and slower until it finally turns around and starts slowly going back towards the sun.
Link Posted: 2/24/2016 10:17:27 PM EDT
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Originally Posted By Rickesis:

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Originally Posted By Rickesis:
Originally Posted By Molotov357:
The ball would oscillate with an attenuating amplitude until settling at the center.



The tragic but inevitable result of friction.

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Link Posted: 2/24/2016 10:19:10 PM EDT
Link Posted: 2/24/2016 10:21:15 PM EDT
[Last Edit: 2/24/2016 10:24:27 PM EDT by j_hooker]
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Originally Posted By akodo:
this is basically what a comet does.  

Ball would accelerate faster and faster as it approached the center.  Then as soon as it passed the center it would slow down, but it would have picked up so much speed that it would take a long time to slow down.  It would stop at the south pole and then start dropping back towards the center.  Assuming no air resistance or other outside forces, it would continue to travel north to south, then back south to north.


Comet same thing, sun pulls it closer and closer faster and faster util it loops past the sun and starts going away, at a high speed but slowing down a tiny bit.  It goes out further and further slower and slower until it finally turns around and starts slowly going back towards the sun.
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Originally Posted By akodo:
Originally Posted By j_hooker:
Without looking it up, ponder this question:

If a hole was drilled through the earths axis (from north to south) and you then dropped a ball in the northern hole, what would happen? Forget about temperature in this exercise. Gravitational force would pull the ball down. But as it pass through the earths core what happens? Does the ball become suspended or does it continue to fall thus shooting the ball out  the opposing southern hole?
this is basically what a comet does.  

Ball would accelerate faster and faster as it approached the center.  Then as soon as it passed the center it would slow down, but it would have picked up so much speed that it would take a long time to slow down.  It would stop at the south pole and then start dropping back towards the center.  Assuming no air resistance or other outside forces, it would continue to travel north to south, then back south to north.


Comet same thing, sun pulls it closer and closer faster and faster util it loops past the sun and starts going away, at a high speed but slowing down a tiny bit.  It goes out further and further slower and slower until it finally turns around and starts slowly going back towards the sun.

You are correct!  It would pop out on the southern pole at the same height that it was initially dropped from. Then it would fall back in the hole on the southern pole and pendulum back to the exact same spot you initialy dropped it and you would catch it .
Link Posted: 2/24/2016 10:22:13 PM EDT
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Originally Posted By j_hooker:

Would it settle?
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Originally Posted By j_hooker:
Originally Posted By Rickesis:
Originally Posted By Molotov357:
The ball would oscillate with an attenuating amplitude until settling at the center.


Would it settle?

Yeah. I'm visualizing a damped oscillation.
Link Posted: 2/24/2016 10:22:17 PM EDT
Coriolis effect would blow your ball up.
Link Posted: 2/24/2016 10:24:33 PM EDT
Did Trump drop the ball?
Link Posted: 2/24/2016 10:26:49 PM EDT

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Originally Posted By LowBeta:


unless the holes were funnel-shaped, it would very quickly smash into the side due to conservation of angular momentum.



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the poles, though
Link Posted: 2/24/2016 10:27:54 PM EDT
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Originally Posted By jimhoff:
the poles, though
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Originally Posted By jimhoff:
Originally Posted By LowBeta:
unless the holes were funnel-shaped, it would very quickly smash into the side due to conservation of angular momentum.

the poles, though

Doesn't matter.  Coriolis effect is everywhere...
Link Posted: 2/24/2016 10:28:37 PM EDT
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Originally Posted By j_hooker:

You are correct!  It would pop out on the southern pole at the same height that it was initially dropped from the. Fall back in the hole on the southern pole and pendulum back to the exact same spot you initialy dropped it and you would catch it .
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Originally Posted By j_hooker:
Originally Posted By akodo:
Originally Posted By j_hooker:
Without looking it up, ponder this question:

If a hole was drilled through the earths axis (from north to south) and you then dropped a ball in the northern hole, what would happen? Forget about temperature in this exercise. Gravitational force would pull the ball down. But as it pass through the earths core what happens? Does the ball become suspended or does it continue to fall thus shooting the ball out  the opposing southern hole?
this is basically what a comet does.  

Ball would accelerate faster and faster as it approached the center.  Then as soon as it passed the center it would slow down, but it would have picked up so much speed that it would take a long time to slow down.  It would stop at the south pole and then start dropping back towards the center.  Assuming no air resistance or other outside forces, it would continue to travel north to south, then back south to north.


Comet same thing, sun pulls it closer and closer faster and faster util it loops past the sun and starts going away, at a high speed but slowing down a tiny bit.  It goes out further and further slower and slower until it finally turns around and starts slowly going back towards the sun.

You are correct!  It would pop out on the southern pole at the same height that it was initially dropped from the. Fall back in the hole on the southern pole and pendulum back to the exact same spot you initialy dropped it and you would catch it .


That's what would happen if there is no air resistance and if you don't take into account other forces which might alter the experiment such as the Earth having an uneven density.

With air resistance the ball would reach terminal velocity rather quickly. And the air would get denser and denser as the ball approached the center of the Earth which would lower terminal velocity. By the time the ball was at the bottom of a 4,000 mile deep atmosphere it would be moving very slowly and likely would be crushed. (Guess it depends on what kind of ball it is)
Link Posted: 2/24/2016 10:28:50 PM EDT
Wind resistance and terminal velocity probably disagree with your theory.
Link Posted: 2/24/2016 10:29:11 PM EDT
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Originally Posted By j_hooker:

Would it settle?
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Originally Posted By j_hooker:
Originally Posted By Rickesis:
Originally Posted By Molotov357:
The ball would oscillate with an attenuating amplitude until settling at the center.


Would it settle?


It would lose energy moving the earth. Both would settle at a new center of gravity.
Link Posted: 2/24/2016 10:29:35 PM EDT
[Last Edit: 2/24/2016 10:29:48 PM EDT by fatalerror113]


Originally Posted By j_hooker:



Without looking it up, ponder this question:





If a hole was drilled through the earths axis (from north to south) and you then dropped a ball in the northern hole, what would happen? Forget about temperature in this exercise. Gravitational force would pull the ball down. But as it pass through the earths core what happens? Does the ball become suspended or does it continue to fall thus shooting the ball out  the opposing southern hole?
View Quote
It would oscillate back and forth eventually settling at the center due to air resistance slowing it down.





 
Link Posted: 2/24/2016 10:30:55 PM EDT
I'm sure I watched this on Bugs Bunny once.

Looney Tunes has the answer you seek.
Google 'Elmer Fudd' for a shortcut.
Link Posted: 2/24/2016 10:31:19 PM EDT
[Last Edit: 2/24/2016 10:39:00 PM EDT by j_hooker]
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Originally Posted By Thuban:


That's what would happen if there is no air resistance and if you don't take into account other forces which might alter the experiment such as the Earth having an uneven density.

With air resistance the ball would reach terminal velocity rather quickly. And the air would get denser and denser as the ball approached the center of the Earth which would lower terminal velocity. By the time the ball was at the bottom of a 4,000 mile deep atmosphere it would be moving very slowly and likely would be crushed. (Guess it depends on what kind of ball it is)
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Originally Posted By Thuban:
Originally Posted By j_hooker:
Originally Posted By akodo:
Originally Posted By j_hooker:
Without looking it up, ponder this question:

If a hole was drilled through the earths axis (from north to south) and you then dropped a ball in the northern hole, what would happen? Forget about temperature in this exercise. Gravitational force would pull the ball down. But as it pass through the earths core what happens? Does the ball become suspended or does it continue to fall thus shooting the ball out  the opposing southern hole?
this is basically what a comet does.  

Ball would accelerate faster and faster as it approached the center.  Then as soon as it passed the center it would slow down, but it would have picked up so much speed that it would take a long time to slow down.  It would stop at the south pole and then start dropping back towards the center.  Assuming no air resistance or other outside forces, it would continue to travel north to south, then back south to north.


Comet same thing, sun pulls it closer and closer faster and faster util it loops past the sun and starts going away, at a high speed but slowing down a tiny bit.  It goes out further and further slower and slower until it finally turns around and starts slowly going back towards the sun.

You are correct!  It would pop out on the southern pole at the same height that it was initially dropped from the. Fall back in the hole on the southern pole and pendulum back to the exact same spot you initialy dropped it and you would catch it .


That's what would happen if there is no air resistance and if you don't take into account other forces which might alter the experiment such as the Earth having an uneven density.

With air resistance the ball would reach terminal velocity rather quickly. And the air would get denser and denser as the ball approached the center of the Earth which would lower terminal velocity. By the time the ball was at the bottom of a 4,000 mile deep atmosphere it would be moving very slowly and likely would be crushed. (Guess it depends on what kind of ball it is)

I was considering that there was no air
Link Posted: 2/24/2016 10:31:53 PM EDT
it would keep falling then slow down get sucked back in, fall again thru the center and keep going until it got yanked down again...etc
Link Posted: 2/24/2016 10:34:18 PM EDT
[Last Edit: 2/24/2016 10:37:00 PM EDT by Greenhorn]
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Originally Posted By j_hooker:

You are correct!  It would pop out on the southern pole at the same height that it was initially dropped from. Then it would fall back in the hole on the southern pole and pendulum back to the exact same spot you initialy dropped it and you would catch it .
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Originally Posted By j_hooker:
Originally Posted By akodo:
Originally Posted By j_hooker:
Without looking it up, ponder this question:

If a hole was drilled through the earths axis (from north to south) and you then dropped a ball in the northern hole, what would happen? Forget about temperature in this exercise. Gravitational force would pull the ball down. But as it pass through the earths core what happens? Does the ball become suspended or does it continue to fall thus shooting the ball out  the opposing southern hole?
this is basically what a comet does.  

Ball would accelerate faster and faster as it approached the center.  Then as soon as it passed the center it would slow down, but it would have picked up so much speed that it would take a long time to slow down.  It would stop at the south pole and then start dropping back towards the center.  Assuming no air resistance or other outside forces, it would continue to travel north to south, then back south to north.


Comet same thing, sun pulls it closer and closer faster and faster util it loops past the sun and starts going away, at a high speed but slowing down a tiny bit.  It goes out further and further slower and slower until it finally turns around and starts slowly going back towards the sun.

You are correct!  It would pop out on the southern pole at the same height that it was initially dropped from. Then it would fall back in the hole on the southern pole and pendulum back to the exact same spot you initialy dropped it and you would catch it .


In a vacuum, yes, but I'm sure the hole would fill with air.  And air pressure would get higher the deeper in the hole, and so drag would increase.  I think that at the center of the hole the air pressure would be so high that the object's terminal velocity would be very low, and it would only travel a few hundred or thousand feet past the core before falling back.
Link Posted: 2/24/2016 10:34:38 PM EDT
as it travels to the center of the earth, the cross sectional area of earth it is passing thorugh is increasing. It will be drawn to the side of the hole eventually and get stuck.
Link Posted: 2/24/2016 10:35:59 PM EDT
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Originally Posted By TexasTechVette:
as it travels to the center of the earth, the cross sectional area of earth it is passing thorugh is increasing. It will be drawn to the side of the hole eventually and get stuck.
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Which side?  If you're drilling right through the center of gravity, by definition you have the same mass on all sides, so the object would not be drawn anywhere but straight through the hole.
Link Posted: 2/24/2016 10:36:35 PM EDT
What is with all the science today?
Link Posted: 2/24/2016 10:37:50 PM EDT
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Originally Posted By AZ_Sky:
I'm going with, it will oscillate back and forth through the hole until it gives up all of its energy and eventually coming to a stop at the core.
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Link Posted: 2/24/2016 10:38:40 PM EDT
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Originally Posted By j_hooker:

Not at all, it's a true physics question.
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Originally Posted By j_hooker:
Originally Posted By Dirtydog:
Originally Posted By j_hooker:
Without looking it up, ponder this question:

If a hole was drilled through the earths axis (from north to south) and you then dropped a ball in the northern hole, what would happen? Forget about temperature in this exercise. Gravitational force would pull the ball down. But as it pass through the earths core what happens? Does the ball become suspended or does it continue to fall thus shooting the ball out  the opposing southern hole?

Sorry, not to be a nerd, but this is only a way to start a 'funny', right?

Not at all, it's a true physics question.


The earths axis is not the same as the magnetic, right? Who's the physics teacher?
Link Posted: 2/24/2016 10:39:35 PM EDT
You would have uncontrolled illegal penguin migration to the Arctic promised land.

Plus friction, Coriolis effect, hitting the sides of the walls, blah blah blah thought exercise. The ability to create the experiment, much less make it a controlled one, does not exist. Kinda like measuring something exceeding light speed.
Link Posted: 2/24/2016 10:40:25 PM EDT
Assuming that the ball is traveling through the Z axis, the Crossectional area of the earth in the X-Y plane is constantly changing because of the earths topography and the fact that it is not totally perfectly spherical. It would be very hard to model.
Link Posted: 2/24/2016 10:41:01 PM EDT
[Last Edit: 2/24/2016 11:35:37 PM EDT by huaco]
If you could eliminate friction with air and the walls of the hole the object would arrive at the other end and stop very briefly in about 42 minutes.  The hole does not have to be through the center of the earth, it could be a straight line tunnel from anywhere to anywhere else on the surface and the trip would take 42 minutes.  Shorter distances would mean less acceleration and velocities but energy is conserved and it all works out to 42 minutes. This subject was covered in one of my physics classes back around 1970.  It would make a great transportation system but for friction, heat, and other problems involved with deep drilling.

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