Perl: the Markov chain saw PerlMonks

### Comment on

 Need Help??

How does one 'explode' anything 'very, very gently'?

For what it's worth, you're exactly right...nothing has to 'explode'. It really is all kinetic energy...the closing velocity between two objects at the altitudes discussed are about 14 km/sec (or a little under 14 miles/sec).

About 15 years ago I was associated with a project to test hypervelocity impacts on the ground...by hypervelocity we meant velocities in excess of about 2 km/sec...which was the most we could create with very specialized devices called rail-guns (which were electromagnetic accelerators that could fire a small piece of steal (about the size of a thimble, but solid rather than hollow like a thimble) by a long series of elecromagnets that would successively accelerate the thimble faster and faster). They fired it into an embankment of heavy clay dirt...to see what it would do (seems like the old saying 'The difference between boys and men are the cost of their toys').

It basically left a crater about the equivalent of 50 to 60 feet across and about 10 to 15 feet deep...from a heavy thimble!

Another annecdote is the infamous (well...infamous in my business) paint fleck (about 2 mm square and about a few thounsands of an inch thick) that struck one of the space Shuttle's forward windows. Those windows are about 4-6 inches thick specially made glass-like material. The collision, estimated at about 4-5 km/sec gouged out a crater about 1/2 way through the window and was about 4-5 inches across at the surface of the window.

At 14 km/sec...the collision doesn't just vaporize most of the matter...it actually creates an ionized plasma out of much of the matter. The rest is varying degrees of dust and debris of a surprisingly large variety of shapes and sizes.

So 'explosions' are of no particular value...the kinetic energy of the collision is plenty.

ack Albuquerque, NM

In reply to Re^7: "Practices and Principles" to death by ack
in thread "Practices and Principles" to death by ack

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

• Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
• Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
• Read Where should I post X? if you're not absolutely sure you're posting in the right place.
• Posts may use any of the Perl Monks Approved HTML tags:
a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
• You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
 For: Use: & & < < > > [ [ ] ]
• Link using PerlMonks shortcuts! What shortcuts can I use for linking?

Create A New User
Chatterbox?
and all is quiet...

How do I use this? | Other CB clients
Other Users?
Others making s'mores by the fire in the courtyard of the Monastery: (5)
As of 2018-06-20 19:03 GMT
Sections?
Information?
Find Nodes?
Leftovers?
Voting Booth?
Should cpanminus be part of the standard Perl release?

Results (117 votes). Check out past polls.

Notices?