[time-nuts] SI Unit Problems

cook michael michael.cook at sfr.fr
Tue Apr 5 17:18:04 UTC 2011


Le 05/04/2011 17:51, Jim Lux a écrit :
>
> On 4/5/11 8:25 AM, Brooke Clarke wrote:
>> Hi:
>>
>> Just reading at:
>> http://futureboy.us/frinkdata/units.txt
>>
>> First about the candela and all it's problems, then what's a Time Nut 
>> issue  "Hz ".
>>
>> // This means that, if you follow the rules of the SI,
>> // 1 Hz = 1/s = 1 radian/s which is simply inconsistent and violates 
>> basic
>> // ideas of sinusoidal motion, and is simply a stupid definition.
>>
Isn't his premiss wrong?  I see no required relation between s^-1 or 
1/s  and angular measure. If I am dropping rocks into a pool at 1 second 
intervals I get splashes at 1Hz . Not many radians in that.  Maybe that 
is why cps was dropped.
> actually 1/s (= Hz) = 2*pi rad/sec
>
> BTW, if anyone is confused, I have a handy direct reading graph 
> published by HP a few decades ago to assist engineers in converting 
> from cycles per second to Hertz.  I'll see if I can scan it and attach 
> it later.  I know I really should have mentioned this last Friday.
>
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