P213_Exam__1_F06

# P213_Exam__1_F06 - Physics 213 Your Name Section Number...

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Physics 213 Prelim 1 Fall 2006 page 2 of 14 1 True/False (10 pts) Indicate T (True) or F (False) in the space at left for each of the following statements. No partial credit: ____ If the radius of a steel ball increases by 0.1% when it is heated, its surface area will increase by about 0.3%. ____ A thermodynamic system run clockwise through any thermodynamic p-V cycle will perform (positive) work on its environment. ____ The atmospheric pressure on planet Zaphod is above the triple point for CO 2 . A lake of liquid CO 2 could exist on Zaphod’s surface. ____ The heat Q added to an ideal gas in a process is always nC v Δ T. ____ The pressure in an ideal gas can be shown to be direct consequence of the total (translational and rotational) kinetic energy of the molecules. ____ Covering your wall with an additional layer of material with an R value less than the R for the wall’s existing insulation will increase the heat current through the wall. ____ The entropy of a fixed volume of gas that interacts irreversibly with its environment must necessarily increase. ____ While an ideal gas undergoes a thermodynamic process with no phase changes, pV=nRT does not necessarily hold. ____ An ideal gas in a volume V undergoes free expansion into a volume 2V, and is then isothermally compressed back into a volume V. The entropy CHANGES of the gas (dS_gas) and of the heat reservoir used in the isothermal compression (dS_res) satisfy dS_gas > 0, dS_res > 0. ____ When an ideal gas is expanded in a thermally insulated container, its temperature remains constant. Multiple choice.
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P213_Exam__1_F06 - Physics 213 Your Name Section Number...

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