PH202 update HW1-2

PH202 update HW1-2 - Oregon State University Physics 202...

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Oregon State University Physics 202 , Winter 2010 HW1-2 (due Jan 15 at 5:00 p.m.) Page 1 17.2 cm 6 . 25 c m water oil liquid V A V B scale vat (drawings not to scale) Block A water level oil d 2 m Block B d 1 h 1 h 2 Oregon State University Physics 202 Winter Term, 2010 HW1-2 Note: This HW assignment, due January 15, covering topics—mixed freely—from Chapter 13 of the text. Of these problems, only 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). These problems are presented in no particular order and may freely use/mix concepts throughout the assigned sections of Chapter 13. Follow the recommended format for problem solutions, use or problem solutions SI units unless directed otherwise, and assume three signi± cant digits in all numerical answers. 1. Pure water and then oil (which donʼt mix) are poured into a U-shaped tube, open at both ends. The liquids come to equilibrium as shown here. What is the oilʼs density? 2. A raft is made of 12 identical logs lashed together. Each log is 36.0 cm in diameter, 7.25 m long, and has a density of 750 kg/m 3 . How many 60-kg persons can the raft hold (fl oating in pure water) while still keeping everyoneʼs feet dry? 3. Using Archimedesʼ Principle and the labels and diagram shown here: (a) prove that if an object is fl oating in a liquid, the fraction of the objectʼs total volume that is immersed (below the surface)
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PH202 update HW1-2 - Oregon State University Physics 202...

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