A U-tube filled with water is closed on one end. The tube is about one meter tal

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A U-tube filled with water is closed on one end. The tube is about one meter tall. When water is removed from the open end, the water level in the closed end does not change.

PRESSURE IN A LIQUID Name ST HW 165 l filled with water is closed on one end. The tube is about one meter tall. When water is removed from the open end, the water level in the closed end does not change. a. What is the pressure at point F before any water is removed? Original water level On the basis of your answer, is there a force exerted by the stopper on the top surface of the water? b The water level on the left is lowered until it reaches point A Does the pressure at point A increase, decrease, or remain the On the basis of your answer, does the pressure at point increase, decrease, or remain the same? Explain. I the pressure changes, how does the change in pressure at point A compare to the change in pressure at point D? Do the pressures at points E and Fincrease, decrease, or remain the same? How do the changes in pressure at these points compare to the change in pressure at point A? Does the force exerted by the stopper on the top surface of the water increase, d or remain the same? Explain. c. Suppose that point Fis 0.5 m above poi E. Determine the pressure at point F. (Hint: What is the pressure at point The of water is p 1000 kgm,g io m/s, and atmospheric pressure P 1.01 x 103 N/m d suppose instead that the tube is much taller than 1.0 m. Calculate the distance above point E at which the pressure in the water would be zero (ie, find the height of water above point E) e.) Use your answers above and the definition of pressure to explain why the water level on the right remains at point F for a U-tube that is 1.0 Tutorials in Introductory Physics OPrentice Hall, Inc McDermott, Shaffer, & PEG., U. Wash First Edition, 2002

Explanation / Answer

(a) Pressure at F is zero.

     There is noi force exerted by stopper on the water.

b.) Pressure at A decreases.

     Pressure at D decreases.

     Change in pressure will be the same for all the points.

      The forece exerted by the stopper on the top surface of the water decreases and becomes negative.

c.) p = -1000kg/m³ * 9.8m/s² * 0.5m + Po = 96 100 Pa

d.) 1000kg/m³ * 9.8m/s² * h = 1.01*10^5 Pa

   h= 10.3 m

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