Volume

J

James2

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Oct 14, 2009
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Hi,

I answered a maths question to find the volume of a beam 5m long like this.
CSA = 1182mm[sup:2fn40we1]2[/sup:2fn40we1]
= 1.182m[sup:2fn40we1]2[/sup:2fn40we1]
gives 1.182 x 5 = 5.91m[sup:2fn40we1]3[/sup:2fn40we1]
This was the wrong answer, with 1.182m[sup:2fn40we1]2[/sup:2fn40we1] underlined. Could the answer be?
CSA = 1182mm[sup:2fn40we1]2[/sup:2fn40we1]
= 1.182 x10[sup:2fn40we1]3[/sup:2fn40we1]m[sup:2fn40we1]2[/sup:2fn40we1]
gives 1.182x10[sup:2fn40we1]3[/sup:2fn40we1] x 5 = 5.91x10[sup:2fn40we1]3[/sup:2fn40we1]m[sup:2fn40we1]3[/sup:2fn40we1]

Thanks,
James
 
I'f I was to say the answer to the question. What is the volume of a beam 5m long if the cross sectional area is 1182mm.

= 0.001182m[sup:bl9kvotk]2[/sup:bl9kvotk] x 5m = 0.0059m[sup:bl9kvotk]3[/sup:bl9kvotk] = 5.9x10[sup:bl9kvotk]-3[/sup:bl9kvotk]m[sup:bl9kvotk]3[/sup:bl9kvotk]

Would I be answering the question correctly.

Thanks,

James
 
James2 said:
I'f I was to say the answer to the question. What is the volume of a beam 5m long if the cross sectional area is 1182mm[sup:3v69oksv]2[/sup:3v69oksv].

= 0.001182m[sup:3v69oksv]2[/sup:3v69oksv] x 5m = 0.0059m[sup:3v69oksv]3[/sup:3v69oksv] = 5.9x10[sup:3v69oksv]-3[/sup:3v69oksv]m[sup:3v69oksv]3[/sup:3v69oksv]

Would I be answering the question correctly. ..... Yes

Thanks,

James
Click to expand...
 
the cross sectional area is measured in square units.
If it's third dimension, length, is 1 unit, then the cross-sectional area
in square units is numerically the same as the volume in cubic units.
That's for a shape with constant cross-sectional area.
Hence, any multiple of that or fraction of that only requires multiplying
by the value of the third dimension (height or length) .
 
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