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Unformatted text preview: Oregon State University PH 202 Winter Term 2012 HW1-2 (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 Work-Energy 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 1-9 will all be scored: #1-4 are worth 1 point each; #5-9 are worth 2 points each. For questions #10-29, 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 half-full 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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