Selected Solutions
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Chapter 15: Fluids Selected Solutions |
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Selected Solutions
17. At the interface of the top of the barrel and the bottom of the tube, the pressure can have only one value if there is static equilibrium. If W is the weight of the water in the tube and F is the force on the top of the barrel, we have
Taking the diameters of the barrel and tube to be D and d, respectively, solving for the weight of water gives
25. (a) The bag must be placed at a height such that the depth of the fluid will increase the fluid pressure from atmospheric pressure to the needed value of 109 kPa.
(b) Increased, to compensate for the reduction in pressure resulting from the lower density; the gauge pressure in a fluid is directly proportional to its density.
35. (a) Use Siri's formula to solve for the person's density.
(b) 
(c) The apparent weight in water is the weight in air minus the buoyant force.
45. We can make direct use of the equation of continuity where the area through which the water flows equals the width of the river times its depth.
55. From Exercise 15-4, we know that for this situation
The force is directed upward because the outside wind reduces the outside pressure.
Selected Solutions by David Reid, Eastern Michigan University. ©2002 by Prentice Hall, Inc.
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