A rectangular tank with an 6 ft by 5 ft cross section is 10 ft deep. It has its

Question

A rectangular tank with an 6 ft by 5 ft cross section is 10 ft deep. It has its top at ground level and is used to catch runoff water. Assume that the water weighs 62.4 pounds per cubic feet.

a) How much work does it take to empty the tank by pumping the water back to ground level once the tank is full? Answer: ___ft-lb

b) If the water is pumped to ground level with a (5/11)-horsepower (hp) motor (work output 15000 ft-lb/min), how long will it take to empty the full tank in minutes?

Explanation / Answer

->work=6*5*10*62.4=18720 ftlb ->time= 18720/15000=1.248 min

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