Greenwood press
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book-20600
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VOLUME dimensions need to be measured so that an appropriate amount of cement is brought to the site. Suppose a driveway 12 feet wide and 30 feet long is needed for a new home, and the cement poured needs to be 1.25 feet deep so that it will not break apart under pressure from automobiles or extreme temperatures. The volume of cement needed to complete this job can be determined by the product of its dimensions, since the cement will fill into a rectangular prism. Therefore the amount of cement needed is (12)(30)(1.25) = 450 cubic feet. If a bag of cement mixture prepares 0.75 cubic feet of concrete, then the cement truck will need to contain 600 bags of mixture in order to create the driveway. Since each bag is about a hundred pounds, multiple trucks will be needed to carry the 60,000 pound load. The dispersion of an oil spill can be predicted based on the amount of oil that is lost. On March 24, 1989, the oil tanker Exxon Valdez struck Bligh Reef in Prince William Sound, Alaska, spilling more than 11 million gallons of oil. There are 231 cubic inches in a gallon, so the spill had an approximate volume of 254 billion (231 × 11,000,000 = 254,100,000,000) cubic inches of oil. Thousands of marine animals and fish were killed by the oil that contaminated the water. As oil spreads, it typically leaves a layer that is 1/100 inch thick on the surface of the water. The direction of the spill is influenced by the placement of the spill and the direction of the ocean’s current. In this circumstance, much of the oil had brushed on shore, at the beaches. What if the spill had happened in the middle of the ocean? Imagine the effect of spilling water in an open space on the floor. Assuming that the floor is flat, the spill will disperse in nearly a circular region. If the oil had spilled in the middle of the ocean without land interference, the spill could have covered nearly 2.5 billion (254,100,000,000 ⋆ 1/100) square inches of the surface of the water. If the path of the oil dispersed in the shape of a cir- cle, then it could have spread in a radius of close to half a mile. This information can be determined by solving for r in the equation πr 2 = 2,541,000,000, and then converting the inch units to miles. There are 5,280 feet in one mile, and 12 inches in a foot. Therefore the conversion is 5,280 × 12 = 63,360 inches for every mile. Benjamin Franklin was one of the first to determine that very little oil will spread out over a huge area of water. His work actually gave one of the first estimates of the thickness of a molecule of oil, even though no one in Franklin’s time knew about molecules. online sources for further exploration Aluminum tanks Application to environmental health Balloon volumes Download 1.81 Mb. Do'stlaringiz bilan baham: |
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