PSN-L Email List Message

Subject: Re: Zero-length spring
From: ""
Date: Sun, 03 Dec 2006 03:30:16 +1300

Hi John
In this formula a NEWTON is what?  or how or why is called a NEWTON the rest 
I understand so a


Cheers Tamati
From the Castle of Tamati, Hinemoa and Karauwa the Dog
From the Castle of Tom, Robyn and the Dog

I'm Just a Stone's Throw Away:- NZ-021-150-33-59 or NZ-07-855-0195
                              Bush Telegragh:-
                       My Regular Pitstop:- Tamati
19-356 CENTRAL
----- Original Message ----- 
From: "John or Jan Lahr" 
Sent: Thursday, November 30, 2006 8:20 PM
Subject: Re: Zero-length spring

> At 10:29 PM 11/29/2006, you wrote:
>>Hi John,  I am not too good at math, could you please plug-in some 
>>examples/numbers for this formula so I can understand it better? I think 
>>its k that I am unclear of.  I understand the rest. Thanks, Ted
>>MgA = kSY/(SA)
>>M = kY/(Ag)
> k is the spring constant.  In this example I'm using k = 2 newtons/cm
> M is the mass
> Y is the height of the mast
> A is the length of the boom
> g is the acceleration of gravity
> The exact numbers don't really matter - the point being that the mass will 
> be stable at any angle of the boom.
> There are problems of trying to actually build this device, because slight 
> changes in k with temperature will cause instability.  Even without a 
> zero-length spring, one can extend the period by reducing the height of
> the mast.  However, you will soon discover that this will also lead to 
> instability if pushed to too long a period.
> Cheers,
> John
> __________________________________________________________
> Public Seismic Network Mailing List (PSN-L)
> To leave this list email PSN-L-REQUEST@.............. with the body of the 
> message (first line only): unsubscribe
> See for more information. 


Public Seismic Network Mailing List (PSN-L)

[ Top ] [ Back ] [ Home Page ]