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I thought that Ze'ev did make a good point with the menstrual synchrony example: It apparently doesn't happen in humans, or at least the evidence for it is highly in doubt.
*From:* brian whatcott <email@example.com>
*Sent:* Monday, September 16, 2013 8:07 AM
*Subject:* Re: [Phys-L] Mesmerizing
If this is too far from Ze'ev's comfort zone, there is an everyday
example of coupling
resonant circuits by way of very small energy increments, applied
cyclically. It's called radio for short, these days.
Or if he insists on narrowing the discussion to mechanical coupling,
there is the ever-popular instance of
foot-soldiers marching in-step across a bridge (though here, the bridge
resonances would be expected to
occupy lower frequencies.)
Brian Whatcott Altus OK
On 9/15/2013 8:31 PM, Ze'ev Wurman wrote:
> Oh yeah ... should we go to the history of hysteria too?
> This is phys-l ... at least I thought so :-)
> On 9/15/2013 5:17 PM, brian whatcott wrote:
>> my comment carefully did not limit itself to mechanically coupled
>> You will recall the experimental studies of female student menstrual
>> cycle coupling, for example.
>> Brian Whatcott Altus OK
>> On 9/15/2013 5:37 PM, Bernard Cleyet wrote:
>>> On 2013, Sep 15, , at 11:04, Ze'ev Wurman <firstname.lastname@example.org <mailto:email@example.com>> wrote:
>>>> On 9/15/2013 8:00 AM, brian whatcott wrote:
>>>>> Actually, it is found that very small amounts of energy applied
>>>>> cyclically, will eventually synchronize devices which share a
>>>>> resonant frequency. Applies to electronic devices too, despite
>>>>> Z'ev's misgivings.
>>>> Perhaps a more careful reading would have helped you. All I wrote
>>>> is that "Much harder to achieve with electronic metronomes." Any
>>>> coupled systems will affect each other, but it is harder to get
>>>> mechanical coupling affect electronic gizmos unless they were
>>>> designed for it (e.g., mechanically coupled tuning capacitor/coil).
>>>> Read before jumping.
>>>> Forum for Physics Educators
>>>> Physfirstname.lastname@example.org <mailto:Physemail@example.com>
>>> Unavoidably easy w/ microphonic tubes. May have been the prob. RP
>>> solved by exchanging tubes.
>>> Yes an e-metronome using, for example, a Wien selected tubed
>>> oscillators, I suspect, would be subject to mechanical coupling.
>>> bc has encountered the prob. in a more modern radio, and made an
>>> e-metronome in the sixties.
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