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Author Topic:   Throwing Stuff Down A Mineshaft
Larni
Member
Posts: 4000
From: Liverpool
Joined: 09-16-2005


Message 7 of 69 (493325)
01-08-2009 9:02 AM
Reply to: Message 6 by cavediver
01-08-2009 8:54 AM


Re: Thought experiment
If you get half way to the center would the mass behind you begin to exert gravitational influence on you?
When you get to the middle (say hi to Doug Maclough) would you be in free fall?
Edited by Larni, : Spacing

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Larni
Member
Posts: 4000
From: Liverpool
Joined: 09-16-2005


Message 11 of 69 (493330)
01-08-2009 9:25 AM
Reply to: Message 9 by cavediver
01-08-2009 9:16 AM


Re: Thought experiment
You are weightless anywhere inside the shell, yet anything outside the shell feels the inward gravitational pull as normal!
That's one hell of a good trick!
Is it something like being a massive lagrange point covering the volume of the inside of the sphere?
Sometimes I really do wish I had the brains to have study physics rather than psychology

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Larni
Member
Posts: 4000
From: Liverpool
Joined: 09-16-2005


Message 15 of 69 (493334)
01-08-2009 9:33 AM
Reply to: Message 13 by Coragyps
01-08-2009 9:31 AM


Being pulled down a well is the penalty for being a goat.

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Larni
Member
Posts: 4000
From: Liverpool
Joined: 09-16-2005


Message 18 of 69 (493339)
01-08-2009 9:57 AM
Reply to: Message 12 by cavediver
01-08-2009 9:28 AM


Re: Thought experiment
Just a thought, but what happens to the gravitational energy inside the sphere?
If every point is the equivalent of being in free fall does all of that energy increase the mass of the sphere or is the gravity actually cancelled out (having no ability to do work)?
I appreciate this probably sounds like nonsense

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Larni
Member
Posts: 4000
From: Liverpool
Joined: 09-16-2005


Message 22 of 69 (493349)
01-08-2009 10:46 AM
Reply to: Message 19 by Parasomnium
01-08-2009 10:00 AM


Re: Thought experiment
If there's no air resistance, there's no reason why it wouldn't fall all the way to the opposite side, to the same height it was released from, and then fall back, again to the same height, etc. In other words, without air resistance, it would endlessly oscillate between both extremes without diminishing amplitude.
Would'nt there be some loss of energy in heat that would slow it down eventually?

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Larni
Member
Posts: 4000
From: Liverpool
Joined: 09-16-2005


Message 37 of 69 (493384)
01-08-2009 1:10 PM
Reply to: Message 24 by Stile
01-08-2009 10:53 AM


Re: Thought experiment
Thanks for clearing that one up, Stile.
I really must stop thinking, now: my head hurts

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Larni
Member
Posts: 4000
From: Liverpool
Joined: 09-16-2005


Message 38 of 69 (493385)
01-08-2009 1:15 PM


How wonderful
How wonderful that we can get from goats to Dyson spheres in less than 40 post.
EvC is a really odd place

  
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