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From: Jim Pennino <jimp@gonzo.specsol.net>
Newsgroups: sci.physics
Subject: Re: Message to Bertie.
Date: Sat, 9 Nov 2024 06:14:10 -0800
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bertietaylor <bertietaylor@myyahoo.com> wrote:
> On Sat, 9 Nov 2024 3:54:15 +0000, Jim Pennino wrote:
> 
>> bertietaylor <bertietaylor@myyahoo.com> wrote:
>>> On Sat, 9 Nov 2024 0:41:01 +0000, bertietaylor wrote:
>>>
>>>> On Fri, 8 Nov 2024 21:29:06 +0000, Jim Pennino wrote:
>>>>
>>>>> bertietaylor <bertietaylor@myyahoo.com> wrote:
>>>>>> On Fri, 8 Nov 2024 16:02:42 +0000, Jim Pennino wrote:
>>>>>>
>>>>>>> bertietaylor <bertietaylor@myyahoo.com> wrote:
>>>>>
>>>>> <snip old crap>
>>>>>
>>>>>> Fool, with the low voltage given and its huge mass the momentum of the
>>>>>> armature beats that of most high power rifle bullets.
>>>>>
>>>>> Utter nonsense, crackpot.
>>>>>
>>>>> Railguns don't have an armature, they fire projectiles through the air,
>>>>> crackpot.
>>>>
>>>> The projectile is the armature, of the linear motor that in this case is
>>>> the railgun, Penisnino, most extraordinary ignoramus.
>>>>>
>>>>> The muzzle energy of the very common 7.62x51mm NATO cartridge is
>>>>> typically around 3,346 J.
>>>>
>>>> Weight of bullet is say 7g
>>>> Muzzle velocity is 300m/s
>>>> So ke is 0.5mv^2=0.5*.007*300^2=.0035*90000=3150J so okay
>>>>>
>>>>> The muzzle energy of the very common 5.56x45mm NATO cartridge is
>>>>> typically around 1756 J.
>>>>>
>>>>> What is the muzzle energy of your low speed linear motor, crackpot?5
>>>> 0.5*4000*1.5^2= 2000*2.25=4500J, Penisnino
>>>
>>> Sorry we made a mistake above, it should be
>>> 0.5 * 4 * 1.5^2 = 4.5 J and not 4500J.
>>>
>>>> which is greater than 3346J or 3150J or 1756J.
>>>
>>> We were wrong, but in Arindam's railgun design we do not talk of energy
>>> except for efficiency we talk momentum.
>>
>> Railguns, actually ALL guns, are ALWAYS specified in energy as that is
>> the important parameter and no one cares about momentum, crackpot.
> 
> Moron, ALL guns are specified in terms of *muzzle velocity*

Actually, it is the ammunition that is specified in terms of muzzle
velocity, crackpot.

<snip remaining babble>