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Chapter_14 - Physics 42 Spring 2008 Problem Set Fluids...

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Physics 42 Spring 2008 Problem Set: Fluids These problems are from the eighth edition of Halliday, Resnick and Walker, Chapter 14. 1. Problem 3 2. Problem 11 3. Problem 29 4. Problem 33 t 5. Problem 37 6. Problem 43 7. Problem 49 8. Problem 53 9. Problem 55 10. Problem 65 11. Problem 80 (Answer: 3.82 m/sec 2 ) 12. If the speed of air flow past the lower surface of an airplane wing is 100 m/sec, what speed of air flow over the upper surface will give a pressure difference of 900 Pa between the upper and lower surfaces? 1 Pa = 1 N/m 2 density of air = 1.3 x 10~' g/cm 3 (Answer: 116 m/sec)
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/ An office window has dimensions 3.4 m by 2.1 m. As a result of the passage of a storm, the outside air pressure drops to 0.9.6 a tin, but inside the pressure is held at 1.0 atm. What net force pushes the window out? p ^ : 0.94 P - /. r in _ r. —7 F* PA A
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= /y 0, - J a
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7 K? V7 7 =
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Three children, each of weight 356 N, make a log raft by lashing together logs of diameter 0.30 m and length 1.80 m. How many logs will be needed to keep them afloat in fresh water? Take the density of logs to be 800 kg per cubic meter.
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