# Why are water towers very tall structures and often placed on high elevations

Short Answer:1. A weight lifter holds 900 N (about 200 lb) over his head. Is he doing work on theweights?2. Car B is traveling twice as fast as car A but car A has three times the mass of car B.Which car has the greater kinetic energy?3. Why are water towers very tall structures and often placed on high elevations?4. Distinguish between total energy and mechanical energy.5. A simple pendulum as shown below oscillates back and forth. Use the letterdesignations in the figure to identify the pendulum’s position(s) for the followingconditions. (There may be more than one answer. Consider the pendulum to be idealwith no energy losses.)a)b)c)d)e)f)g)h)i)j)Position(s) of instantaneous rest:Position(s) of maximum velocity:Position(s) of maximum Ek:Position(s) of maximum Ep:Position(s) of minimum Ek:Position(s) of minimum Ep:Position(s) after which Ek increases:Position(s) after which Ep increases:Position(s) after which Ek decreasesPosition(s) after which Ep decreases:

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