Re: Which one penetrates more easily...?

From	Poutnik <poutnik4nntp@gmail.com>
Newsgroups	sci.physics
Subject	Re: Which one penetrates more easily...?
Date	2016-12-01 07:00 +0100
Organization	Good company
Message-ID	<o1oe72$8gl$1@dont-email.me> (permalink)
References	<LSK%z.49713$X11.21707@fx19.am4>

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Dne 01/12/2016 v 02:17 JiiPee napsal(a):
> If I want to prove/test that a car with a speed of 400 km/hour can not
> penetrate a certain width of steel plate is this logic valid:
> 
>  I know that a bullet cannot penetrate that plate so a much slower car
> would not penetrate it neither.

Invalid
> 
> I know there is energy involved. Does this car have so much more energy
> that it can still penetrate that plate even though a bullet cannot? (say
> bullet it made of very hard material).

without needed info, it is hard to say,
as for both the bullet and the car
is hard  to determine the available / needed energy ratios.
> 
> But on the other hand bullet is much thinner so isnt it true that it
> penetrates more easily?

As a rule of thumb, without any needed balistic knowledge,
the needed energy is proportional to the impact crossection,
while available energy is 1/2.m.v^2.

For the same shape and structure,
the crosssection is proportional to m^(2/3).




-- 
Poutnik ( The Pilgrim, Der Wanderer )

A wise man guards words he says,
as they say about him more,
than he says about the subject.

Thread

Which one penetrates more easily...? JiiPee <no@notvalid.com> - 2016-12-01 01:17 +0000
  Re: Which one penetrates more easily...? Poutnik <poutnik4nntp@gmail.com> - 2016-12-01 07:00 +0100
    Re: Which one penetrates more easily...? JiiPee <no@notvalid.com> - 2016-12-01 11:17 +0000
      Re: Which one penetrates more easily...? Poutnik <poutnik4nntp@gmail.com> - 2016-12-01 13:42 +0100
  Re: Which one penetrates more easily...? "reber g=emc^2" <herbertglazier0@gmail.com> - 2016-12-01 09:33 -0800
    Re: Which one penetrates more easily...? "hanson" <hanson@quick.net> - 2016-12-01 10:30 -0800
  Re: Which one penetrates more easily...? Yuri Kreaton <invlaid@invalid.com> - 2016-12-01 12:39 -0600
    Re: Which one penetrates more easily...? JiiPee <no@notvalid.com> - 2016-12-01 22:22 +0000
      Re: Which one penetrates more easily...? Odd Bodkin <bodkinodd@gmail.com> - 2016-12-01 16:28 -0600
      Re: Which one penetrates more easily...? Poutnik <poutnik4nntp@gmail.com> - 2016-12-02 07:07 +0100
  Re: Which one penetrates more easily...? jimp@specsol.spam.sux.com - 2016-12-01 19:16 +0000
    Re: Which one penetrates more easily...? JiiPee <no@notvalid.com> - 2016-12-01 22:24 +0000
      Re: Which one penetrates more easily...? Yuri Kreaton <invlaid@invalid.com> - 2016-12-01 17:00 -0600
      Re: Which one penetrates more easily...? jimp@specsol.spam.sux.com - 2016-12-01 23:06 +0000
        Re: Which one penetrates more easily...? JiiPee <no@notvalid.com> - 2016-12-02 00:13 +0000
  Re: Which one penetrates more easily...? "nuny@bid.nes" <Alien8752@gmail.com> - 2016-12-01 15:19 -0800
    Re: Which one penetrates more easily...? "reber g=emc^2" <herbertglazier0@gmail.com> - 2016-12-01 15:51 -0800
      Re: Which one penetrates more easily...? "hanson" <hanson@quick.net> - 2016-12-01 17:12 -0800
    Re: Which one penetrates more easily...? Yuri Kreaton <invlaid@invalid.com> - 2016-12-01 19:03 -0600
    Re: Which one penetrates more easily...? benj <benj@nobody.net> - 2016-12-01 20:44 -0500

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