HW8-10 - Oregon State University Physics 202 HW8-10 Winter...

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Oregon State University Physics 202 , Winter 2010 HW8-10 (due March 12 at 5:00 p.m.) Page 1 Oregon State University Physics 202 Winter Term, 2010 HW8-10 This HW assignment, due March 13, covers topics from Chapters o 11 and 12 of the text—and some may also use concepts and relations from other chapters covered this term. Of these ten problems, three will be scored (for a possible 30 points). Donʼt forget the extra credit point that is available, too—see the course web site, under the links for recitation/Homework (HW). Follow the recommended format for problem solutions, use SI units unless directed otherwise, and assume three signi± cant digits in all numerical answers. Note that you may need to refer to a periodic table—thereʼs one in your textbook. 1. Helium (He), a monatomic gas, f lls a 0.031-m 3 container. The pressure oF the gas is 5.6 x 10 5 Pa. How long would a 0.333-hp engine have to run (1 hp = 746 W) to produce an amount oF energy equal to the internal energy oF this gas? 2. The pressure oF a certain tank oF sulFur dioxide (SO 2 ) is 3.21 x 10 4 Pa. There are 214 moles oF this gas in a volume oF 40.0 m 3 . ±ind the translational rms speed oF these gas molecules. Note: Although this gas is not monatomic (and would thus have some signi± cant kinetic energy due to rotation of its molecules) , we can still approximate its translational kinetic energy (and therefore its translational rms speed) using the monatomic ideal gas model. 3. A heat engine produces a total oF 425 J oF work by using an ideal gas in these three processes: Beginning at a pressure oF 1.32 x 10 5 Pa and a volume oF 2.20 x 10 -3 m 3 , the pressure is increased isochorically to 5.70 x 10 5 Pa. Next, the gas expands adiabatically back to its original pressure. ±inally, its volume is reduced isobari- cally back to its original volume. Calculate the eFf
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HW8-10 - Oregon State University Physics 202 HW8-10 Winter...

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