Question

water flows along a pipe of radius 0.6cm at 8cm per second the pipe is drawing the water from a tank which holds 1000 litres of water when full how long will it take to completely empty the tank
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Answer 1

Answer:

ANSWER

1 litre = 1000 cm3

∴ volume of tank =  1000000 cm3

volume of water flowing out of the pipe per second = πr2l

where r is the radius of the pipe and l is the flow per second

r=0.6cm and l=8cm/s

substituting the values we have volume of water flowing out of the pipe per second = 9.0477cm3/s 

∴ time taken to empty tank = volumeofflowingoutthroughthepipepersecondvolumeoftank  =9.04771000000 =110525.32seconds 

i.e 30.7 hours.