# HW6-7 - Oregon State University Physics 202 Winter Winter...

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Oregon State University Physics 202 , Winter 2010 HW6-7 (due Feb. 22 at 5:00 p.m.) 7 Page 1 Oregon State University Physics 202 Winter Term, 2010 HW6-7 This HW assignment, due February 22, covers topics—mixed freely, mainly from Chapter 12 (and possibly other chapters) of the text. Of these 13 problems, two will be scored (for a possible 20 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 . 1. A spherical balloon is made from a rubber material. The mass of the rubber is 4.00 kg. The thickness of the rubber is negligible compared to the 2.00-m radius of the balloon. The balloon is F lled with helium (He). The temperature of the helium and all the surrounding air is 25°C. The balloon just ﬂ oats in the air (neither rising nor sinking). The density of the air is 1.20 kg/m 3 . ±ind the absolute pressure of the helium. 2. A cylinder containing 6.95 moles of helium gas is initially Before After as shown in the F rst drawing here. The cylinder cover is free to slide up or down the cylinder, but it is at rest. The space above the cylinder cover is open to the atmosphere. Then a block is placed on the cylinder cover and the cover moves slowly into the other position shown. When it has arrived at that position (and is again at rest), the temperature of the helium has increased by 10.0°C. Using the above information and the following data, determine the mass of the block. d = 0.623 m; h 1 = 5.17 m; h 2 = 4.83 m The mass of the cylinder cover is 5.24 kg. 3. At 20.0°C, a steel tank is 98.0% F lled with gasoline, then tank and fuel are heated together. At what tempera- ture will the gasoline begin to overﬂ ow? [ β gasoline = 950 x 10 -6 (°C) -1 ; β steel = 36 x 10 -6 (°C) -1 ] 4. A common drinking glass is F lled to the brim with 350 mL of water at 100°C. If the temperature is then al- lowed to cool to 20.0°C, how much water (in mL) could be added to the glass? 5. A hollow glass block ﬂ oats in a container of ethyl alcohol. Initially, everything is at a temperature of 20°C, and 6% of the block is above the surface of the alcohol. If you heat the container (gradually and evenly ev- erything warms up together), at what temperature will the block sink to the bottom?

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HW6-7 - Oregon State University Physics 202 Winter Winter...

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