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Unformatted text preview: Price: $ 670 2. When a sh swims with velocity v ft/sec against a current with velocity u ft/sec, the energy it expends per second is proportional to v 3 (it is kv 3 for some constant k ). Note that the net swimming velocity of the sh is v-u ft/sec. Suppose the current of a river is observed to be 5 ft/sec and k = 2 for a certain sh. Write a formula that expresses the total energy E expended by the sh as it travels a distance of 300 feet. See related problem in textbook 3. Packaging: A cylindrical tube, constructed of heavy cardboard with plastic ends, must hold a volume of 144 cubic feet. Express the cost of the tube as a function of radius r if cardboard is $ 1 per square foot and plastic is $ 3 per square foot? C ( r ) = 288 r + 6 r 2...
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- Spring '08