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Unformatted text preview: Homework Chapter 14 Questions: 16: Upon inhaling you increase the volume of water displaced, buoyant force must increase. 18. The level of the water falls. Reasoning: When anchor is thrown overboard it sinks and displaces a volume of water equal to the volume of the anchor, which is small. When the anchor is in the boat the buoyant force must be equal to the weight of the boat plus the weight of the anchor. As the total volume of water is the same in both cases, the water height must be greater when the anchor is in the boat. 22. The air in your lungs, the blood in your arteries and veins, and the protoplasm in each cell exert nearly the same pressure, so that the wall of your chest can be in equilibrium. 26.Adding styrofoam to the ship increases the mass of the ship, although its volume is unchaged. Hence the effective density of the ship increases. The ship floats lower in the water. 28. A breeze from any direction speeds up to go over the mound and the air pressure drops. Air then flows through the burrow from the lower entrance to the upper entrance. Problems for Chapter 14: 9.What must be the contact area between a suction cup (completely exhausted) and a ceiling if the cup is to support the weight of an 80.0kg student? upward force = weight = 80 g = 784 N = Pressure x Area of suction cup Pressure = 1 atmosphere = &¡ ¢ £¤¥¦§¨© Area = ª«¬ &¡ ¢ & ¡¡ª«¬ ® ¯ & ª«¬°® ¯ 10.(a) A very powerful vacuum cleaner has a hose 2.86 cm in diameter. With no nozzle on the hose, what is the weight of the heaviest brick that the cleaner can lift? 16. Figure P14.16 shows Superman attempting to drink water through a very long straw. With his great strength he achieves maximum possible suction. The walls of the tubular straw do not collapse. (a) Find the maximum height through which he can lift the water. (b) What If? Still thirsty, the Man of Steel repeats his attempt on the Moon, which has no atmosphere. Find the difference between the water levels inside and outside the straw....
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 Fall '08
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 Physics, Force, Work, Suction

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