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Unformatted text preview: Oregon State University PH 202 Winter Term 2012 HW12 (due Tuesday, January 24, 5:00 p.m.) This HW is due January 24. These problems may use and mix concepts in the relevant sections of Chapter 13plus the basics of Newtons Laws and the WorkEnergy equation. For the longer problems, diagram/label all parts with variable names (not numbers)and use those labels to solve the problem as far as possible befor e putting in numbers. Where needed, use density values found in the textbook. Use SI units unless directed otherwise; use 3 signifcant digits in fnal answers. Questions 19 will all be scored: #14 are worth 1 point each; #59 are worth 2 points each. For questions #1029, two will be scored (chosen by the scorers), worth 3 points each. 1. Which statement is true? (A) For any 1 kg o incompressible uid, its volume decreases when the pressure on it increases. (B) If you have two wooden blocks, A and B, with identical outer dimensions (L x W x H), but different densities ( r A &gt; r B ), and both oat in the same pool, the buoyant force on each block is the same. (C) When you sip liquid through a drinking straw, you are creating a space in your mouth that has negative gauge pressure. (D) All of the above. (E) A and B only. (F) A and C only. (G) B and C only. (H) None of the above. 2. Which statement is false? (A) If a bucket of bricks is sitting (fully immersed) on a scale at the bottom of a pool o water, that scale reading is less i the bottom o the pool is 5 m deep than if it is 3 m deep. (B) Any object that is 50% immersed in a uid has a density that is hal o the uids density. (C) Any object that is 100% immersed in a uid must have a density greater than the uids density. (D) All of the above. (E) A and B only. (F) A and C only. (G) B and C only. (H) None of the above. 3. Which statement is true? (A) As you place an ice cube in a halffull glass of water (and no water spills out as a result), the water pressure on the bottom of the glass will increase....
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 Winter '08
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 Physics, Energy, Work

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