Re: [Phys-L] coffee

["Don" <dgpolvani@gmail.com>]

Yes, equipment-wise it's the same design.  Also, using a vertical plane for rotation instead of a horizontal plane is also the same.  However, I really don't like the explanation given for how it works in terms of "fake" forces.  He does mention that extra forces arise in accelerating frames as compared to non-accelerating frames, but makes their appearance seem magical and then consistently labels them "fake forces" instead of the natural result of using an accelerating frame to describe the motion. 

> -----Original Message-----
> From: Phys-l [mailto:phys-l-bounces@mail.phys-l.org] On Behalf Of Roger Key
> Sent: Friday, January 31, 2020 11:51 AM
> To: Phys-L@phys-l.org
> Subject: Re: [Phys-L] coffee
>
> Perhaps this is similar to the "swinging tray" from this posting?
>
> https://www.wired.com/2016/09/physics-love-james-bond-cocktail-tricks/
>
>
> Roger Key
> Instructional Support
> 559-278-2728
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> ------------------------------
>
>
> On Fri, Jan 31, 2020 at 8:41 AM Strickert, Rick <
> rstrickert@signaturescience.com> wrote:
>
> > ... or one could use a coffee cup with a lid.    That solves the problem
> > of resonance and bumping into someone around the corner.
> >
> > Rick Strickert
> > Austin, TX
> >
> > -----Original Message-----
> > From: Phys-l <phys-l-bounces@mail.phys-l.org> On Behalf Of Ron
> > Mcdermott via Phys-l
> > Sent: Friday, January 31, 2020 10:38 AM
> > To: Phys-L@phys-l.org
> > Cc: Ron Mcdermott <rmcder@gmail.com>; phys-l@mail.phys-l.org
> > Subject: Re: [Phys-L] coffee
> >
> > I would think the primary thing would be to alter cadence so you are
> > not setting up a resonance.
> >
> > Sent from my iPhone
> >
> > > On Jan 31, 2020, at 10:57 AM, Anthony Lapinski <alapinski@pds.org>
> > wrote:
> > > Now that I have your attention!
> > >
> > > I see faculty walking past my room with their coffees every morning.
> > > Is there an optimal walking frequency (speed) to minimize the liquid
> > > from sloshing back and forth and spilling over? I imagine this
> > > depends on the leg length, diameter of cup, depth of cup, etc.
> > >
> > > P.S. I've never had coffee, but I'm curious about this sloshing
> > phenomenon.
> > > --
> > >
> > >
> > > <http://www.pds.org>
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