38. A hemispherical tank full of water is emptied by a pipe at the rate of 3 litres
per second. How much time will it take to empty half the tank, if it is 3 min
diameter ? (Take * = )
1
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3min=180s=>540litres, sent out half tank, therefore total 1080 litres capacitive hemisphere,(2/3)pi *r^3=1080.
=>r=8, d=16 meters
=>r=8, d=16 meters
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