[Phys-l] Amplitude as a function of g. Was: Re: drop a metal cylinder through a solenoid

[Bernard Cleyet <bernardcleyet@redshift.com>]

On 2012, Mar 21, , at 14:42, Bernard Cleyet wrote:

> p.s. I thought to use a Helmholz system to make the force constant on a magnet on a pendulum bob, and then realized,  no force on a magnet in a constant (vector) field.



This was to test the effect of g variation on a pendulum's amplitude.

I'd modeled this using leapfrog, but not convinced a valid model -- so many assumptions.  Also, there's an advanced** theorem (can't specify as at a Barnes and Noble Wi-Fi)   that states conjugate pairs (products / sums?) are constant w/ slowly varying factors.  The example in the text (Soviet) is raising the support on a pendulum, which is the same as g, if accelerated.

Anyway, I finally discovered a method, other than using a drop chamber,     One:  pendulum on an air table tilting.  and Two:  The suspension a sleeve bearing w/ thrust bearing and tilting it.  All the pages (an hour search?) consider only the period and both commercial apps. are unsuitable because the tilt is not at the suspension, so a change in the height complicates,   Sooo as w/  Dr. Mungan's question anyone done this or heard or read of it?

** Rather rare, but reportedly in the current ed. of Goldstein, and a web page(s); to hurried to search for now.

bc