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Reconsider the above problem. In order to drain the tank faster, a pump is installed near the tank exit as in the figure. Find how much pump power input is necessary to establish an average water velocity of when the tank is full at . Also, assuming the discharge velocity to remain constant, find the time required to drain the tank. Someone suggests that it makes no difference whether the pump is located at the beginning or at the end of the pipe, and that the performance will be the same in either case, but another person argues that placing the pump near the end of the pipe may cause cavitation. The water temperature is , so the water vapor pressure is , and the system is located at sea level. Investigate if there is the possibility of cavitation and if we should be concerned about the location of the pump.
Consider the chlorination of (S)-2 -chloropentane at C4. (a) Write structural formulas for the products, showing three dimensions at all chirality centers. Give each its proper (R, S) designation. (b) What is the stercoisomeric relationship between these products? (c) Are both products chiral? (d) Are both optically active? (e) Could the products be separated by conventional means? (f) What other dichloropentanes would be obtained by chlorination of (S)-2-chloropentane? (g) Which of these are optically active?