a hemispherical tank is emptied by a pipe at the rate of 5 litres per minute how long will it take to half empty the tank if it is 1.5 m in diameter.
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Diameter = 1.5m = 150cm
radius = 150/2 = 75cm
Volume = 4/3 πr³
= 4/3 • 22/7 • 75 • 75 • 75
= 4 • 22 • 25 • 75 • 10.7
= 1765500 cm³
Rate = 5litres per minute = 5×1000 = 5000cm³ per minutes...
Time taken = 1765500/5000 = 353.1 minute or ~353 minute
radius = 150/2 = 75cm
Volume = 4/3 πr³
= 4/3 • 22/7 • 75 • 75 • 75
= 4 • 22 • 25 • 75 • 10.7
= 1765500 cm³
Rate = 5litres per minute = 5×1000 = 5000cm³ per minutes...
Time taken = 1765500/5000 = 353.1 minute or ~353 minute
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