[GNC] [OT] Re: GnuCash 5.9 on macOS 15.2 Dev Beta

[Stephen M. Butler]

On 11/4/24 08:26, William Prescott wrote:
> Electrons move very slowly in copper, about 1 cm/sec. The question is the signal speed in copper, which is about half the speed of light. I got this from a couple
I think you are missing a decimal point and a few zeros between said 
point and the 1.  The velocity factor of wire is between 0.80 - 0.95.  
(80-95%)That implies a slowdown of 5-20% -- not the near 100% that would 
get to 1 cm/sec. Taking the 80% factor and the 11.8" calculated below 
would give a length around 9" -- which is the length I remember getting 
when attending a lecture for (then) Capt Grace Hopper.
> On 4 Nov 2024, at 10:00, Michael or Penny Novack via gnucash-user<gnucash-user at gnucash.org>  wrote:
>
> On 11/4/2024 10:45 AM, Robert Heller wrote:
>> The Speed of Light = 299 792 458 m / s
>> Nano =0^-9
>>
>> 299792458 * 10^-9 =2997924580m = 29.9792458000cm = 11.8028526771in
>>
> Excuse me, but that is in a vacuum. Would be slower in some other medium (like that length of fiber). And while electrons can approach the speed of light in a vacuum, they move slower in that copper wire.
>
> For example, the reason a prism bends light is that the speed of light in glass is lower than in air.
>
> Michael D Novack
>
>
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