Plzz solve question no. 23
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Radius of the hemispherical tank=3/2 m
Volume of the hemispherical tank=2/3πr³ cu.units
=2/3×22/7×3/2×3/2×3/2=99/14 m³=99/14×1000 l=49500/7 litres (1 m³=1000 l)
Volume of the half of tank=(1/2)×(49500/7)=24750/7 litres
Volume of water emptying in 1 s=25/7 l
Time required to empty 25/7 l=1 s
Time required to empty 1 l=1/(25/7)=7/25 s
Time required to empty 24750/7 l=(24750/7)×(7/25)=990 s=990/60=16.5 min=16 min 30 s(Ans.)
We can save water by the following ways:
(i)We should not waste water and should close the taps when they are running for no use.
(ii)We can harvest water by rainwater harvesting during the rainy season.
Volume of the hemispherical tank=2/3πr³ cu.units
=2/3×22/7×3/2×3/2×3/2=99/14 m³=99/14×1000 l=49500/7 litres (1 m³=1000 l)
Volume of the half of tank=(1/2)×(49500/7)=24750/7 litres
Volume of water emptying in 1 s=25/7 l
Time required to empty 25/7 l=1 s
Time required to empty 1 l=1/(25/7)=7/25 s
Time required to empty 24750/7 l=(24750/7)×(7/25)=990 s=990/60=16.5 min=16 min 30 s(Ans.)
We can save water by the following ways:
(i)We should not waste water and should close the taps when they are running for no use.
(ii)We can harvest water by rainwater harvesting during the rainy season.
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