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Unformatted text preview: Oregon State University PH 202 Winter Term 2012 HW3-4 (due Monday, February 6, 5:00 p.m.) This HW is due February 6. These problems may use and mix concepts in the relevant sections of Chapters 14 and 15. 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 or other physical constants 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 1/2 point each; #5-9 are worth 1 point each. ¡or questions #10-19, one will be scored (chosen by the scorers), worth 3 points. –––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– 1. Which quantities are physically (A) (2 p / l )x unitless? (B) L / g (C) m / k (D) All of the above. (E) A and B only. (¡) A and C only. (G) B and C only. (H) None of the above. –––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– 2. Which statement is true? (A) A mass-spring system doesn’t oscillate in a circle, but nevertheless it has an w (omega) value associated with it. (B) In a spring/mass system, a stiffer spring will cause the same mass to oscillate more slowly. (C) All else being equal, sound generally travels faster in a warmer gas than in a cooler gas. (D) All of the above. (E) A and B only. (¡) A and C only. (G) B and C only. (H) None of the above. –––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– 3. Which statement is false? (A) The loudness ( b value) of a sound can never be less than 0 dB. (B) The intensity of a 100 dB sound is 10 times more than the intensity of a 10 dB sound. (C) A 100 dB sound is twice as loud to you (in your brain) as a 50 dB sound. (D) All of the above. (E) A and B only. (¡) A and C only. (G) B and C only. (H) None of the above. –––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– 4. Which statement is true? (A) The decibel scale is (physically) unitless....
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This note was uploaded on 03/10/2012 for the course PH 202 taught by Professor Staff during the Winter '08 term at Oregon State.
- Winter '08