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Chapter 10: Q20Q (page 260)
Explain how the tube in Fig. 10鈥�45, known as a siphon, can transfer liquid from one container to a lower one even though the liquid must flow uphill for part of its journey. (Note that the tube must be filled with liquid to start with.)
The tube must be full of liquid initially for this to work.
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A rowboat floats in a swimming pool, and the level of the water at the edge of the pool is marked. Consider the following situations. (i) The boat is removed from the water. (ii) The boat in the water holds an iron anchor which is removed from the boat and placed on the shore. For each situation, the level of the water will,
(a) Rise.
(b) Fall.
(c) Stay the same.
As water flows from a low elevation to a higher elevation through a pipe that changes in diameter,
(a) The water pressure will increase.
(b) The water pressure will decrease.
(c) The water pressure will stay the same.
(d) Need more information to determine how the water pressure changes.
(II)A 6.0 cm diameter horizontal pipe gradually narrows to 4.5 cm. When water flows through this pipe at a certain rate, the gauge pressure in these two sections is 33.5 kPa and 22.6 kPa, respectively. What is the volume rate of flow?
Water and then oil (which don鈥檛 mix) are poured into a U-shaped tube, open at both ends. They come to equilibrium as shown in Fig. 10鈥�50. What is the density of the oil? [Hint: Pressures at points a and b are equal. Why?]
A hurricane-force wind of \({\bf{180}}\;{\bf{km/h}}\) blows across the face of a storefront window. Estimate the force on \({\bf{2}}{\bf{.0}}\;{\bf{m \times 3}}{\bf{.0}}\;{\bf{m}}\) the window due to the difference in air pressure inside and outside the window. Assume the store is airtight so the inside pressure remains at 1.0 atm. (This is why you should not tightly seal a building in preparation for a hurricane.)
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