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Re: [Phys-L] coffee

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 [] On Behalf Of Roger Key
Sent: Friday, January 31, 2020 11:51 AM
Subject: Re: [Phys-L] coffee

Perhaps this is similar to the "swinging tray" from this posting?

Roger Key
Instructional Support
[web <>][facebook


On Fri, Jan 31, 2020 at 8:41 AM Strickert, Rick <> 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 <> On Behalf Of Ron
Mcdermott via Phys-l
Sent: Friday, January 31, 2020 10:38 AM
Cc: Ron Mcdermott <>;
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 <>

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



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