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P404-Midterm2aa-S08

# P404-Midterm2aa-S08 - Physics 404 Second Midterm Test...

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Physics 404: Second Midterm Test Name ( print ): "I pledge on my honor that I have not given or received any unauthorized assistance on this examination." April 17, 2008 Sign Honor Pledge: Don't get bogged down on any problem you find difficult. Skip ahead and go through all 4 pages, then come back to it afterwards!! If you find a question ambiguous, ask or write a short explanation of why.) Much of the reference information at the end should be of help. 1. A block of lead with heat capacity C is cooled from T h by plunging it into a cold bath at T . a) What is the change in entropy of the lead? b) What is the change in entropy of the water in the cold bath? c) What is the total change in entropy? Is it positive, negative, or 0? d) If the lead block is instead cooled in steps by plunging it successively into baths at intermediate temperatures, indicate how the various entropies above change. 2. Consider expansion of a thermally isolated ideal gas, with initial pressure p i , to 3 times the initial volume. a) If the expansion is done reversibly (e.g. by pushing on a piston), how much work is done by the gas?

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