a hemispheric tank,of a diameter 3m . Is full of water. it is being emptied by a pipe at the rate of 3 whole 4/7 litre per second. how much time will it take to make the tank half empty ? ( use pie=22/7)
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Step-by-step explanation:
Radius of the hemispherical tank =
2
3
=1.5 m
Volume of a hemisphere of radius 'r' =
3
2
πr
3
Hence, volume of the tank =
3
2
×
7
22
×
2
3
×
2
3
×
2
3
=
14
99
m
3
Half of the volume of the tank =
28
99
m
3
=
28
99
×1000 litres
To empty, 3
7
4
=
7
25
litres, time is one second
To empty
28
99
×1000 litres, time =
7
25
28
99
×1000
=990 seconds =16.5 min
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