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[Phys-L] Perpetual Motion Machine, Earth as



Might as well open this one up for critique:


Earth is a better perpetual motion machine than anything on it could ever
be, say, relative to a human lifetime.


On Wed, Mar 25, 2015 at 7:42 AM, Peter Schoch <pschoch@fandm.edu> wrote:

So, we've gotten to the point in the semester where the students are
finding things on the Internet they want me to explain -- in addition to
covering the 'normal' material.

One student found this:

https://www.youtube.com/watch?v=7KqOwJKWIAw

and wants me to explain how this is NOT a perpetual motion machine.

I think I can explain the chain one fairly well. I'm having trouble with
the liquid motion one, explaining it in terms of freshman physics.

Any suggestions would be welcome.

Peter Schoch
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