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Chapter 14: Fluids

Fundamentals Of Physics
Pages: 386 - 412

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112 Questions for Chapter 14: Fluids

  1. A cylindrical tank with a large diameter is filled with water to a depth D=0.30m. A hole of cross-sectional area A=6.5cm2in the bottom of the tank allows water to drain out.

    Found on Page 410
  2. The intake in Figure has cross-sectional area of0.74m2and water flow at 0.40m/s. At the outlet, distance D=180mbelow the intake, the cross-sectional area is smaller than at the intake, and the water flows out at 9.5m/sinto the equipment. What is the pressure difference between inle

    Found on Page 410
  3. Question: A pitot tube (Figure) on a high-altitude aircraft measures a differential pressure of 180Pa. What is the aircraft’s airspeed if the density of the air is 0.031kg/m3?

    Found on Page 386
  4. A garden hose with an internal diameter of 1.9cmis connected to a (stationary) lawn sprinkler that consists merely of a container with 24holes, each 0.13cmin diameter. If the water in the hose has a speed of 0.91m/s, at what speed does it leave the sprinkler holes?

    Found on Page 410
  5. The plastic tube in Figure has a cross-sectional area of5.00cm2. The tube is filled with water until the short arm (of lengthd=0.800m) is full. Then the short arm is sealed and more water is gradually poured into the long arm. If the seal will pop off when the force on it exceeds9.80N, what total height of water in the long arm will put the seal on the verge of popping?

    Found on Page 407
  6. We have three containers with different liquids. The gauge pressure pgversus depth his plotted in Fig. 14-28 for the liquids. In each container, we will fully submerge a rigid plastic bead. Rank the plots according to the magnitude of the buoyant force on the bead, greatest first.

    Found on Page 406
  7. Giraffe bending to drink. In a giraffe with its head 2.0m above its heart, and its heart 2.0mabove its feet, the (hydrostatic) gauge pressure in the blood at its heart is250 torr. Assume that the giraffe stands upright and the blood density is 1.06×103kg/m3. (a) In torr (or role="math" localid="1657260976786" mmHg), find the (gauge) blood pressure at the brain (the pressure is enough to perfuse the brain with blood, to keep the giraffe from fainting). (b) torrIn (ormmHg), find the (gauge) blood pressure at the feet (the pressure must be countered by tight-fitting skin acting like a pressure stocking). (c) If the giraffe were to lower its head to drink from a pond without splaying its legs and moving slowly, what would be the increase in the blood pressure in the brain? (Such action would probably be lethal.)

    Found on Page 407
  8. The maximum depth dmaxthat a diver can snorkel is set by the density of the water and the fact that human lungs can function against a maximum pressure difference (between inside and outside the chest cavity) of 0.050atm.What is the difference indmaxfor fresh water and the water of the Dead Sea (the saltiest natural water in the world, with a density of1.5×103kg/m3)?

    Found on Page 407
  9. At a depth of 10.9 km, the Challenger Deep in the Marianas Trench of the Pacific Ocean is the deepest site in any ocean. Yet, in 1960, Donald Walsh and Jacques Piccard reached the Challenger Deep in the bathyscaph Trieste. Assuming that seawater has a uniform density of1024kg/m3, approximate the hydrostatic pressure (in atmospheres) that the Trieste had to withstand. (Even a slight defect in the Trieste structure would have been disastrous.)

    Found on Page 407
  10. Calculate the hydrostatic difference in blood pressure between the brain and the foot in a person of height 1.83m. The density of blood is1.06×10kg/m3.

    Found on Page 407

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