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Author Topic:   Throwing Stuff Down A Mineshaft
iano
Member (Idle past 1941 days)
Posts: 6165
From: Co. Wicklow, Ireland.
Joined: 07-27-2005


Message 3 of 69 (493308)
01-08-2009 7:52 AM
Reply to: Message 2 by Parasomnium
01-08-2009 6:38 AM


Re: Thought experiment
Off the top of my head.
It would fall towards the centre with it's rate of acceleration decaying all the way. It would come to a halt(after an infinite amount of time) right in the centre of the earth.
?
Edited by iano, : No reason given.

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 Message 2 by Parasomnium, posted 01-08-2009 6:38 AM Parasomnium has replied

Replies to this message:
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iano
Member (Idle past 1941 days)
Posts: 6165
From: Co. Wicklow, Ireland.
Joined: 07-27-2005


Message 5 of 69 (493320)
01-08-2009 8:47 AM
Reply to: Message 4 by Parasomnium
01-08-2009 8:00 AM


Re: Thought experiment
Flailing wildly around again.
Lets see. Rockets can escape gravitational pull by getting further away from earth. So I suppose acceleration due to gravity increases as you head nearer the centre of the earth.
You drop something from the surface and its acceleration increases all the way to the centre. It overshoots due to momentum but (decaying acceleration due to gravity) pulls it back towards the centre where it overshoots again - but to lesser degree.
In theory this would go on forever - with ever diminishing overshoot
??

This message is a reply to:
 Message 4 by Parasomnium, posted 01-08-2009 8:00 AM Parasomnium has replied

Replies to this message:
 Message 6 by cavediver, posted 01-08-2009 8:54 AM iano has not replied
 Message 8 by Parasomnium, posted 01-08-2009 9:03 AM iano has replied
 Message 10 by cavediver, posted 01-08-2009 9:21 AM iano has replied

  
iano
Member (Idle past 1941 days)
Posts: 6165
From: Co. Wicklow, Ireland.
Joined: 07-27-2005


Message 17 of 69 (493338)
01-08-2009 9:49 AM
Reply to: Message 8 by Parasomnium
01-08-2009 9:03 AM


Re: Thought experiment
No air?? I had been neglecting air.
Overshoot(#1) has momentum(#1) due to being dropped from the surface of the earth. This momentum carries the object past the centre despite the pull of gravity towards centre (now acting on the overshooter) - but not back to the surface. Thus overshoot(#2) has less momentum 'powering' it so it doesn't overshoot as far past centre as overshoot(#1)
??

This message is a reply to:
 Message 8 by Parasomnium, posted 01-08-2009 9:03 AM Parasomnium has replied

Replies to this message:
 Message 19 by Parasomnium, posted 01-08-2009 10:00 AM iano has replied
 Message 20 by Huntard, posted 01-08-2009 10:37 AM iano has not replied

  
iano
Member (Idle past 1941 days)
Posts: 6165
From: Co. Wicklow, Ireland.
Joined: 07-27-2005


Message 26 of 69 (493357)
01-08-2009 11:02 AM
Reply to: Message 19 by Parasomnium
01-08-2009 10:00 AM


Re: Thought experiment
Aah yes! Very good
Deep breath..

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iano
Member (Idle past 1941 days)
Posts: 6165
From: Co. Wicklow, Ireland.
Joined: 07-27-2005


Message 27 of 69 (493358)
01-08-2009 11:06 AM
Reply to: Message 10 by cavediver
01-08-2009 9:21 AM


Re: Thought experiment
Gotcha.
What a funny picture that - oscillating between the opposite sides of the globe - forever. Question for you then: approximately what frequency would this occur at?

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 Message 10 by cavediver, posted 01-08-2009 9:21 AM cavediver has replied

Replies to this message:
 Message 28 by cavediver, posted 01-08-2009 11:15 AM iano has replied

  
iano
Member (Idle past 1941 days)
Posts: 6165
From: Co. Wicklow, Ireland.
Joined: 07-27-2005


Message 29 of 69 (493363)
01-08-2009 11:35 AM
Reply to: Message 28 by cavediver
01-08-2009 11:15 AM


Re: Thought experiment
The ultimate cavediving...
Thanks. I must have been bunking off the day they thought calculus
Edited by iano, : No reason given.
Edited by iano, : ...and spelling

This message is a reply to:
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