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On Jan 14, 2016, at 2:26 PM, Herbert Schulz <herbs@wideopenwest.com> wrote:
On Jan 14, 2016, at 1:14 PM, John Denker <jsd@av8n.com> wrote:
In the context of:
https://www.av8n.com/physics/thermo/state-func.html#sec-internal-energy
On 01/14/2016 08:23 AM, Herbert Schulz wrote:
Yes, imagine a gas instead of the spring. As the gas expands it
pushes the piston and does work.
I say it does /not/ do work. No work is done by (or on) the blue
system. There is no F·dx: At the place where there is a nonzero
force, there is no displacement. At places where there is a
nonzero displacement, there is no force.
Howdy,
Why certainly work is being done by the `blue' box on the `red' box and the `red' box on the `blue' box via the interactive forces (which must be equal and opposite in direction of course).
Good Luck,
Herb Schulz
(herbs at wideopenwest dot com)