A cylindrical water tank is 70cm in diameter to begin with it is full of water a leak starts in the bottom so that it looses 10 litres every 1 hour how long will it take for the water level to fall by 20cm.

32 answers

a 1-cm thick layer of water has a volume of π*35^2 cm^3 = 3.848 L

So, you want to know how long it takes to drain 20cm = 76.97L

76.97L ÷ 10L/hr ≈ 7.7 hr

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am not understanding

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I didn't see the workings

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Explain better

EXPLAIN BETTER

Working is not too explanative

Nothing

So, this is it.
We are asked to determine how long it'd take for 20cm of water to be displaced.

We have r=35cm.
If we take a height of 1 cm, the volume of that would be
3.14 x 35^2 x 1 = 3,846.5cm^3.
3,846.5cm^3 = 3.85L (2 d.p)

For height of 20cm, the volume would be
3.14 x 35^2 x 20 = 76,930cm^3
76,930cm^3 = 76.93L

so, 10L lost in 1 hr, 76.93L will be lost in
76.93/10 = 7.693hrs.

Last explanation very explanatory.
Kudos

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Smart

Thanks for the explanation. it really helps a lot

thank you but what does the caret mean

In mathematics, the caret symbol (^) is often used to denote exponentiation. For example, 2^3 means 2 raised to the power of 3, which is equal to 2 x 2 x 2 = 8.

3.14 x 35^2 x 1 means what

In the expression 3.14 x 35^2 x 1, the caret symbol (^) represents exponentiation. It means that the number 35 is raised to the power of 2. So, 35^2 means 35 raised to the power of 2, which is equal to 35 x 35 = 1225. Therefore, 3.14 x 35^2 x 1 means 3.14 multiplied by 1225 and then multiplied by 1.

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