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The Solutions 1. We know one cubic foot of seawater weighs 64 pounds and our coral sample displaces 1.5 cubic feet. To calculate the pounds of lift we multiply 64 pounds by 1.5 cubic feet and get a total of 96 pounds of lift. Our coral weighs 250 pounds, so we subtract 96 from 250 to see that we still require 154 pounds of lift. If we divide 154 pounds by 64 (the amount displaced by one cubic foot) we see we need an airlift bag of at least 2.4 cubic feet of volume. 2. The sediment samples displace 2 cubic feet of water, 64 pounds each. When multiplied we get 128 pounds of lift. Our samples have a weight of 210 pounds. If we subtract 128 from 210 we see we need an additional 82 pounds of lift. Our bags have a volume of one gallon. One gallon of seawater weighs about eight pounds, so our bags, fully inflated would create eight pounds of lift. Thus we would need 13 bags to send up our sediment samples. Back To The Math Problems. |
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