Bài tập Thủy lực 02(tiếng Anh)
- The pressure at the nose of a small airplane is given by p = ρV 2 /2, where r is the density of air. A U-tube manometer measures 25 cm of water. Determine the airplane’s speed if it is flying at an altitude of 4000 m.
- A submersible has a viewing window that is 60 cm in diameter. Determine the pressure force of the water on the window if the center of the window is 30 m below the surface and the window is at a 45° angle.
- An object with a volume of 1200 cm3 weighs 20 N. What will it weigh when submerged in water?
- A 1-m-high, 2-m-long enclosed tank is filled with water and accelerated horizontally at 6 m/s2. If the top of the tank has a small slit across the back, calculate the distance from the front of the tank on the bottom where the pressure is zero.
- Estimate the force acting on the bottom of the 80-cm-wide tank of Prob. 2.
- Convert 230 kPa to millimeters of mercury, inches of mercury, and feet of water.
- The traffic in a large city is to be studied. Explain how it would be done using (a) the Lagrangian approach and (b) the Eulerian approach.
- An iceberg (specific gravity 0.917) floats in the ocean (specific gravity 1.025). What percent of the volume of the iceberg is under water?
- The specific gravity of a liquid is 0.75. What height of that liquid is needed to provide a pressure difference of 200 kPa?
- 10. Assumea pressure of 100 kPa absolute at ground level. What is the pressure difference between the top of a 3-m-high wall on the outsidewhere the temperature is –20°C and on the inside of a house where the temperature is 22°C? (This difference results in infiltration even if nowind is )