## Maths

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##### Maths

##### Maths

19-05-2009 2:43 PM

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Dont ask why as I may have to tell you

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##### Re: Maths

##### Re: Maths

19-05-2009 2:57 PM

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An acre is 4840 sq yds

So total volume - assuming it is 3 ft average depth - is 4.5 x 4840 x 9 x 3 cu ft = 588,060 cu ft = 16,397 tons = 3,672,928 imperial gallons

Alternatively

4.5 acres is 1.821 hectares and a hectare is 10,000 sq metres so the area is 18,210 sq metres and is 0.915 metres deep so the volume is 16,662 cubic metres and weighs about 16,662 metric tonnes

Typing error corrected

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##### Re: Maths

##### Re: Maths

19-05-2009 3:05 PM

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http://flickr.com/photos/jremigio/22486765/

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##### Re: Maths

##### Re: Maths

19-05-2009 5:38 PM

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##### Re: Maths

##### Re: Maths

19-05-2009 11:42 PM

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##### Re: Maths

##### Re: Maths

20-05-2009 4:50 PM

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Quote from: Oldjim Alternatively

4.5 acres is 1.821 hectares and a hectare is 10,000 sq metres so the area is 18,210 sq metres and is 0.915 metres deep so the volume is 16,662 cubic metres and weighs about 16.66 metric tonnes

Err, you mean 16,660 metric tonnes.

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##### Re: Maths

##### Re: Maths

20-05-2009 4:53 PM

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Isn't a cubic metre 0.1 cubic tonnes? ie. multiplied by 100 rather than 1000?

Perhaps not. Long time since I studied Maths

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##### Re: Maths

##### Re: Maths

20-05-2009 5:01 PM

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bugger - fixed

Quote from: Denzil Err, you mean 16,660 metric tonnes.

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##### Re: Maths

##### Re: Maths

20-05-2009 5:19 PM

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Quote from: Jameseh Isn't a cubic metre 0.1 cubic tonnes? ie. multiplied by 100 rather than 1000?

You're getting yourself mixed up there - a measure of capacity/volume can't in any way 'equal' a measure of weight without some kind of link between the two (i.e. a given density).

But anyway. There are 1000 litres in a cubic metre, one litre of water weighs one kilogramme, and there are 1000 kilogrammes in one metric tonne. Therefore, one metre-cubed of water weighs one metric tonne.

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##### Re: Maths

##### Re: Maths

20-05-2009 5:48 PM

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One definition (from Wikipedia ):

Mathematics is the study of quantity, structure, space, relation, change, and various topics of pattern, form and entity.

And: Elementary arithmetic is the most basic kind of mathematics: it concerns the operations of addition, subtraction, multiplication, and division. Most people learn elementary arithmetic in elementary school.

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##### Re: Maths

##### Re: Maths

20-05-2009 7:12 PM

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Quote from: HPsauce And none of this is mathematics, it's just elementary arithmetic.

...

Their I beg to differ because none of the calculations have allowed for the absorption rate of the lake lining, which would account for a large volume of water until it reaches saturation point. This only applies if the lake does not have an impermeable membrane. Another missing factor is the angle and length of the slope from ground level to the deepest point. The description as it stands is of a lake with 3' vertical sides, which is not normally the case.

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##### Re: Maths

##### Re: Maths

20-05-2009 8:22 PM

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Quote from: HPsauce And none of this is mathematics, it's just elementary arithmetic.

[...]

And: Elementary arithmetic is the most basic kind of mathematics

Is that not a contradiction?

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##### Re: Maths

##### Re: Maths

20-05-2009 8:55 PM

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##### Re: Maths

##### Re: Maths

20-05-2009 10:26 PM

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It is great for converting units.

SW.

3Mb FTTC

https://portal.plus.net/my.html?action=data_transfer_speed

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##### Re: Maths

##### Re: Maths

20-05-2009 10:43 PM

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