A U-shaped tube is filled with water as shown. A. Rank the pressures at points A...
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A U-shaped tube is filled with water as shown. A. Rank the pressures at points A through F. Explain. Is your ranking consistent with the equation P = P, + pgh? Explain. B. The right end of the tube is now sealed with a stopper. The water levels on both sides remain the same. There is no air between the stopper and the water surface. 1. Does the pressure at points A and D increase, decrease, or remain the same? Explain. B. 2. Is the pressure at point E greater than, less than, or equal to the pressure at point D? Does the difference in pressure APg between points D and E change when the stopper is added? Explain. 3. Is the pressure at point F greater than, less than, or equal to atmospheric pressure? Is the force exerted by the rubber stopper on the water surface on the right greater than, less than, or equal to the force exerted by the atmosphere on the water surface on the left? B. C. A syringe is used to remove some water from the left side of the U-tube. The water level on the left side is seen to be lowered, but the water level on the right does not change. Consider the following student dialogue: Student 1: "The pressure at point F must now be higher than atmospheric pressure because the water there is being pushed up against the stopper." Student 2: " think that the pressure at point E must be the same as at point A because they are at the same level. These points are both at atmospheric pressure. So the pressure at point Fis lower than atmospheric pressure because we know that pressure gets less as you go up." B. Student 3: "But water is more dense than air so the pressure at F cannot be less than atmospheric pressure." *D With which student(s), if any, do you agree? A U-shaped tube is filled with water as shown. A. Rank the pressures at points A through F. Explain. Is your ranking consistent with the equation P = P, + pgh? Explain. B. The right end of the tube is now sealed with a stopper. The water levels on both sides remain the same. There is no air between the stopper and the water surface. 1. Does the pressure at points A and D increase, decrease, or remain the same? Explain. B. 2. Is the pressure at point E greater than, less than, or equal to the pressure at point D? Does the difference in pressure APg between points D and E change when the stopper is added? Explain. 3. Is the pressure at point F greater than, less than, or equal to atmospheric pressure? Is the force exerted by the rubber stopper on the water surface on the right greater than, less than, or equal to the force exerted by the atmosphere on the water surface on the left? B. C. A syringe is used to remove some water from the left side of the U-tube. The water level on the left side is seen to be lowered, but the water level on the right does not change. Consider the following student dialogue: Student 1: "The pressure at point F must now be higher than atmospheric pressure because the water there is being pushed up against the stopper." Student 2: " think that the pressure at point E must be the same as at point A because they are at the same level. These points are both at atmospheric pressure. So the pressure at point Fis lower than atmospheric pressure because we know that pressure gets less as you go up." B. Student 3: "But water is more dense than air so the pressure at F cannot be less than atmospheric pressure." *D With which student(s), if any, do you agree?
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Solution A P F P A P B P C and P A P E and P C P D Pressure increases as the elevation decreases or ... View the full answer
Related Book For
Fundamentals of Momentum, Heat and Mass Transfer
ISBN: 978-1118947463
6th edition
Authors: James Welty, Gregory L. Rorrer, David G. Foster
Posted Date:
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