Question

A hemispherical tank of radius 2.4 m is full of water. It is connected with a pipe which empties it at the rate of 7 litres per second. How much time will it take to empty the tank completely?

Answer 1

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FORMULA :

Volume of hemisphere = 1/2 [ 4/3 πr³ ]

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Find Volume of the hemisphere:

Volume = 1/2 [ 4/3 π (2.4)³ ] = 28.953 m³

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Convert m³ to litre:

1 m³ = 1000 litres

28.953 m³ = 28935 litres

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Find time need to empty the tank:

7 litres = 1 second

1 litres = 1/7 second

28935 litres = 1/7 x 28935 = 4136 seconds

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Convert seconds to hours, mins and sec:

4136 seconds = 1 hour 8 minutes 56 seconds

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Answer: It takes 1 hour 8 minutes 56 seconds to empty the tank.

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Answer 2

Answer:

Step-by-step explanation:

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