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Chapter 14: Fluid Mechanics

Physics For Scientists & Engineers
Pages: 417 - 449

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85 Questions for Chapter 14: Fluid Mechanics

  1. An empty metal soap dish barely floats in water. A bar of Ivory soap floats in water. When the soap is stuck in the soap dish, the combination sinks. Explain why.

    Found on Page 437
  2. Question:A small piece of steel is tied to a block of wood. When the wood is placed in a tub of water with the steel on top, half of the block is submerged. Now the block is inverted so that the steel is under water. (i) Does the amount of the block submerged (a) Increase (b) Decrease (c) Remain the same? (ii) What happens to the water level in the tub when the block is inverted? (a) It rises. (b) It falls. (c) It remains the same.

    Found on Page 436
  3. A swimming pool has dimensions 30.0m×10.0mand a flat bottom. When the pool is filled to a depth of 20.0mwith fresh water, what is the force exerted by the water on (a) the bottom? (b) On each end? (c) On each side?

    Found on Page 439
  4. How would you determine the density of an irregularly shaped rock?

    Found on Page 437
  5. Question:A piece of unpainted porous wood barely floats in an open container partly filled with water. The container is then sealed and pressurized above atmospheric pressure. What happens to the wood? (a) It rises in the water. (b) It sinks lower in the water. (c) It remains at the same level.

    Found on Page 436
  6. Calculate the absolute pressure at the bottom of a freshwater lake at a point whose depth is 27.5m. Assume the density of the water is 1.00×103Kg/m3and that the air above is at a pressure of 101.3kpa. (b) What force is exerted by the water on the window of an underwater vehicle at this depth if the window is circular and has a diameter of35.0cm ?

    Found on Page 439
  7. Place two cans of soft drinks, one regular and one diet, in a container of water. You will find that the diet drink floats while the regular one sinks. Use Archimedes’s principle to devise an explanation.

    Found on Page 437
  8. Question:A person in a boat floating in a small pond throws an anchor overboard. What happens to the level of the pond? (a) It rises. (b) It falls. (c) It remains the same.

    Found on Page 436
  9. The free-fall acceleration on the surface of the Moon is about one-sixth that on the surface of the Earth. The radius of the Moon is about0.250RE(RE=Earthsradius)=6.37×106m.. Find the ratio of their average densitiesρMoon/ρEarth.

    Found on Page 439
  10. The water supply for a city is often provided from reservoirs built on high ground. Water flows from the reservoir, through pipes, and into your home when you turn the tap on your faucet. Why does water flow more rapidly out of a faucet on the first floor of a building than in an apartment on a higher floor?

    Found on Page 437

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