From: John Lutzon <jl_at_meteoritecentral.com>
Date: Thu, 28 May 2015 14:48:50 -0400
Thank you Jason, Francesco,
I wasn't sure of when the KE was released and/or what it was capable of.
All best, John
----- Original Message -----
From: Jason Utas
To: John Lutzon
Sent: Wednesday, May 27, 2015 11:15 PM
Subject: Re: [meteorite-list] Chelyabinsk--OT
When meteorites fragment, they don't "explode." Think about the forces at work; ram pressure and internal strain being released.
Theoretically, nothing should be imparted with any "upward" KE. In reality, some fragments do move vertically upward relative to
the bolide's center of mass, but there are no substantive forces at play that would cause fragments to move against gravity --
unless you have a rare event like the '1972 Great Daylight Fireball,' when the object's original trajectory took it skimming across
the atmosphere and back into space.
If bolides did "explode" with appreciable force, try to envision what the structure of a strewnfield would be: instead of larger
masses being concentrated at one end of a strewnfield, they *should* be found all around the periphery of the field -- perhaps
~concentrated at one side due to initial KE, but there would be exceptions. We don't observe that..
On Wed, May 27, 2015 at 10:11 AM, John Lutzon via Meteorite-list <meteorite-list at meteoritecentral.com> wrote:
Dad told me about 55 years ago---if you do not ask yourself or someone else, you may never know.
I asked myself the following question(s) and found info but not the answer...so i'm asking.
Regarding the Chely meteor(at the time)---when it exploded with a yeild of 500 kilotons at an altitude
of 20 miles, was this sufficient energy to throw any mass "straight up" into low orbit? Or does everything
just continue into eventual dark flight?
I realize that mass impacts other mass and may throw objects into space but i'm particularly asking
about 500 kt. at 20 miles with earth's gravity. Any calcs. or studies on this?
Found much info about yeild-vs-altitude-vs-psi at nukefix.org but not an answer.
Thank you, John
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Received on Thu 28 May 2015 02:48:50 PM PDT