Concept explainers
A clear plastic hose is attached to the narrow end of a funnel, and its free end is bent around to point upward (Figure 13.38). When water is poured into the funnel, it rises in the hose to the same level as in the funnel, despite the fact that the funnel has a lot more water in it than the hose. Why does it do this? Where does the force come from to support the weight of the extra water in the funnel?
Figure 13.38
Question 1.
Why the water level is same on the funnel and the tube, the force that supports the weight of the extra water.
Answer to Problem 1CQ
Water levels are the same because the pressure on the funnel and the tube is the same. The water remaining in the tube and the sides of the funnel support the extra water.
Explanation of Solution
Write the expression for pressure.
Here, P is the pressure, h is the height,
Pressure is directly proportional to the height. The funnel and the tube will have the same pressure exerted by atmosphere. Hence, water levels will be the same. Weight of the extra water is supported by the remaining water and the funnel sides.
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