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Math Help - a wood is a circle or square?????

  1. #1
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    a wood is a circle or square?????

    omg.. i dun understand tis question.. plz help~~
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by xiaoz
    omg.. i dun understand tis question.. plz help~~
    Density is mass per unit volume, so we need to convert all the units involved
    to a common base (metres and kgm), find the volume of the wood and divide
    the mass by that volume.

    The wood is 1.2m by 15cm by 3mm, or converting all to metres it is
    1.2m by 0.15m by 0.003m. So the volume is 1.2x0.15x0.003=0.00054 cubic metres.

    Now the mass of the wood is 340g, which is 0.34kg.

    So the density is 0.34/0.00054=629.63 kg/cubic metre,
    which is about 63% the density of water.

    RonL
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  3. #3
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    but y the ans says tis ?
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  4. #4
    Grand Panjandrum
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    Quote Originally Posted by xiaoz
    but y the ans says tis ?
    Are you saying that the given answer is: 19.2m \le L < 20.5?

    If so I suspect that either there is a misprint or you are looking at the
    answer to another question.

    The question here is asking for a density - which will have dimensions
    of mass per unit volume in some appropriate units.

    Also it is asking for two decimal places in the answer.

    RonL
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  5. #5
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    no.. i nv mislook.. i tin the ans is wrong..
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