FIGURE 15-2 -Water Flows in a Pipe as Shown in Figure 15-2

question 57

Multiple Choice

FIGURE 15-2
-Water flows in a pipe as shown in Figure 15-2. The pipe is horizontal at points A and B, then rises in elevation while decreasing in diameter and is again horizontal at points C and D. The vertical tubes at B and D are open at the top, but they enter the pipe and bend at right angles along the centerline of the pipe with their mouths facing the flow (these are Pitot tubes) . Water enters the Pitot tube and rises until the hydrostatic pressure in the tube balances the pressure at the mouth of the tube. Because no more water enters the tube, the speed of the water just outside the mouth of the tube is zero m/s. The pressure in the pipe is unaffected by the Pitot tube. Which of the following statements is correct?

• A) h_B > h_D
• B) h_B < h_D
• C) h_B = h_D
• D) The answer depends on the direction of the flow.
• E) The answer depends on the speed of the flow.

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