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Tara: resolver los problemas: 5, 6, 7, 9, 12, 14, 15, 16, 18, 20, 21 Densidad del agua en Sistema Inglés: Gravedad en Sistema Inglés:

1.94

32.18

1. - A weather report indicates the barometric pressure is 29.75 in of mercury. What is the atmospheric pressure in pounds per square inch? Solución aproximada: 14 15

2. - Find the atmospheric pressure in kilopascals if a mercury barometer reads 742 mm. Solución aproximada: 95 100

3. - An open tank contains 5.7 m of water covered with 2.8 m of kerosene ( Find the pressure at the interface and at the bottom of the tank. Solución aproximada: 20 25 , 75 80

8.0

/

).

4. - The system in figure is at 70 °F. If the pressure at point A is 2900 lb/f2, determine the pressures at points B, C, and D. Solución aproximada: 2820 ⁄ 2850 ⁄ , 3260 ⁄ 3200 ⁄ 3290 ⁄ , 3100 ⁄

5. - Find the pressures at A, B, C, and D in figure. Solución Aproximada: 365 ⁄ 380 ,

, 115

6. - Calculate the pressure, in kPa, at A, B, C, and D in figure. Solución aproximada: 6.5 8.5 , 4.0

⁄

5.5

130

7. - A manometer is attached to a tank containing three different fluids, as shown in figure. What will be the ·difference in elevation of the mercury column in the manometer (i.e., y in figure)? Solución aproximada: 0.5 0.7

0.84, . . 1.0, 96 , and 159 . Find 8. - In figure, . . gage. If the barometer reading is 729 mmHg, what is in mmH20 absolute? Solución aproximada: 9980 9998

in mmHg

9. - At 20 °C, gage A in figure reads 290 kPa abs. What is the height gage B read? Solución aproximada: 1.8 2.5 , 200 208

of water? What does

10. - A manometer is attached to a conduit, as shown in figure. Calculate the pressure at point A. 960 Solución aproximada: 950 ⁄

11. - A differential manometer is shown in figure. Calculate the pressure difference between points A and B. Solución aproximada: 900 ⁄ 910

12. - A differential manometer is attached to a pipe, as shown in figure. Calculate the pressure difference between points A and B. Solución aproximada: 262 ⁄ 266

13. - A manometer is attached to a horizontal oil pipe, as shown in figure. If the pressure at point A is 10 psi, find the distance between the two mercury surfaces in the manometer (i.e., determine the distance in figure). Solución aproximada: 23.5 25.0

14. - Calculate the pressure difference between A and B for the setup shown in figure. 2720 Solución aproximada: 2705 ⁄

15. - Find the difference in pressure between tanks A and B in figure if 160 , 480 , and 230 . Solución aproximada: 80 85

330

,

16. - A cylindrical tank contains water at a height of 55 mm, as shown in figure. Inside is a smaller open cylindrical tank containing cleaning fluid ( . . 0.8) at height h. If 13.42 gage, what are gage pressure and height of 13.40 gage and cleaning fluid? Assume that the cleaning fluid is prevented from moving to the top of the tank. Solución aproximada: 12 13 , 9 10

17. - An open tube is attached to a tank, as shown in figure. If the water rises to a height of 800 mm in the tube, what are the pressures and of the air above the water? Neglect capillary effects in the tube. Solución aproximada: 3.5 4.3 , 4.3 5.3

18. - For the setup shown in figure, calculate the absolute pressure at a. Assume standard atmospheric pressure, 101.3 kPa. Solución aproximada: 84 90

19. - A vertical, rectangular gate with water on one side is shown in figure. Determine the total resultant force acting on the gate and the location of the center of pressure. Solución aproximada: 80 90 , 3.0 4.2

20. - A vertical, triangular gate with water on one side is shown in figure. Determine the total resultant force acting on the gate and the location of the center of pressure. Solución aproximada: 1308 1315 , 6.8 7.4

21. - An inclined, rectangular gate with water on one side is shown in figure. Determine the total resultant force acting on the gate and the location of the center of pressure. Solución aproximada: 11227 11235 , 8.9 9.6