[opendtv] Re: Mag-lev

  • From: "Bob Miller" <robmxa@xxxxxxxxx>
  • To: opendtv@xxxxxxxxxxxxx
  • Date: Wed, 1 Nov 2006 15:38:24 -0500

You already have a trajectory when you step in the hole. Your path
would be a straight line since by definition, for purposes of this
argument, you are in free fall and nothing will attenuate your path.
As you step in you are rotating around the globe at a particular
speed. The "hole", path you will follow will rotate at the same speed.
It is a straight line in a perfect world.

Of course we do not live in a perfect world so you will die a
miserable death about a minute after you start. Probably skinned alive
as you bounce from one side of the hole to the other and long before
you fry from the infernal heat or go kerplop into the molten core that
has filled this hole of yours.

At 42 minutes the F train wins at about 35.

Bob Miller

On 11/1/06, Tom Barry <trbarry@xxxxxxxxxxx> wrote:
Very fast.  Though I don't know how to calculate it since the
acceleration due to gravity would decrease toward the center.

Another thing I can't really calculate is what path you would fall.  It
wouldn't be a straight line, at least if you were not drilling a hole
down the axis of rotation since the planet spins.  But if the Earth were
hollow and you fell (down) off the surface your trajectory would
describe the actual hole you would want to dig to get to the other side.
  I don't even know if it would pass through the center, due to the
planet spin.  But maybe Earth doesn't spin fast enough to make much
difference here.

- Tom

Bob Miller wrote:
> How is this. Free fall is the absence of any resistance or counter
> force to a body's obeying the laws of gravity.
>
> What speed would be reached as you pass the center? Anyone know? I don't
>
> Bob Miller
>
> On 11/1/06, Tom Barry <trbarry@xxxxxxxxxxx> wrote:
>
>> I think it would be effectively free fall everywhere falling thru the
>> center.  At least it should feel like it, the same at both ends and the
>> center.  For that matter it should feel like free fall even if you were
>> just floating motionless at the center.  In all cases there is no
>> relative acceleration pushing one part of your body into another
>> (ignoring human size tidal stress).  But maybe I misunderstand the
>> definition of "free fall".
>>
>> - Tom
>>
>> Manfredi, Albert E wrote:
>> > Bob Miller wrote:
>> >
>> >
>> >>Theoretically the only line where you experience free
>> >>fall is the one thru the center
>> >
>> >
>> > Agreed.
>> >
>> >
>> >>and you would experience it until you reached zero speed
>> >>on the other side
>> >
>> >
>> > Not "free fall" all the way through, because your acceleration is
>> > steadily decreasing throughout the trip, going increasingly negative
>> > (slowing you down more and more) after you go by the core. You should
>> > experience free fall only at the very start opf the journey.
>> >
>> >
>> >>at which I guess someone grabs you before you make a
>> >>return trip, a perpetual yo-yo.
>> >
>> >
>> > Agreed.
>> >
>> > Bert
>> >
>> >
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>> --
>> Tom Barry                       trbarry@xxxxxxxxxxx
>> Find my resume and video filters at www.trbarry.com
>>
>>
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--
Tom Barry                       trbarry@xxxxxxxxxxx
Find my resume and video filters at www.trbarry.com


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