Results of Quiz 4 - Questions 1 and 2 are meant to indicate...

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Questions 1 and 2 are meant to indicate the difference between what we will come to call compressible and incompressible materials. The balloon will more than double is size (that is, over the pressure change V is a large number). In contrast, applying a pressure of 10 5 Pa (1 atm. which is the pressure produced by 10m of water) will cause a fractional change in volume of a piece of steel of about 0.0001%, so the PdV term can safely be neglected. (Incidentally, the liquid water is 100x more compressible than the steel, but even its volume change is only 0.01%.) Question 3 is meant to list three important things about boundary work. All the detail that is included about boundary work in this and other books stems from its great exploitation by engineers in manifold devices and applications. Question 4 stems from the reversibility of isothermal quasi-equilibrium compression and expansion of a gas (of which an experiment like that of Joule’s described on pg 174, with the valve opened slowly, would be an example). Question 5 is just the answers to the problem we obtained in class both manually and with the Hyperphysics calculator.
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