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Math Help - Volume using mass and density.

  1. #1
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    Volume using mass and density.

    This is really easy, but im missing a step and I can't figure out what.

    Question states an object 1.35kg, density is 11.4g/cm^3

    What is its volume?

    So I decided to attempt the question by converting the 1.35kg to 1350g

    V = M/D

    ANSWER A 1350/114 = 118.42cm^3

    alternately, converting g/cm^3 to kg/m^3
    11.4g/cm^3 = 11400kg/m^3

    ANSWER B 1.34/11400 = 0.000188kg^3

    the problem arises when i try converting answer A to kg^3 and answer B to cm^3, they don't match up, anyone catch where my error is?
    Last edited by mr fantastic; December 18th 2011 at 12:29 AM. Reason: Title.
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  2. #2
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    Re: Volume using mass and density... frustrated

    Quote Originally Posted by polskon View Post
    This is really easy, but im missing a step and I can't figure out what.

    Question states an object 1.35kg, density is 11.4g/cm^3

    What is its volume?

    So I decided to attempt the question by converting the 1.35kg to 1350g

    V = M/D

    ANSWER A 1350/114 = 118.42cm^3

    alternately, converting g/cm^3 to kg/m^3
    11.4g/cm^3 = 11400kg/m^3

    ANSWER B 1.34/11400 = 0.000188kg^3

    the problem arises when i try converting answer A to kg^3 and answer B to cm^3, they don't match up, anyone catch where my error is?
    kg^3 ???

    118.42 cm^3 \cdot \frac{1 \, m^3}{10^6 \, cm^3} = 0.000118 \, m^3
    Last edited by skeeter; December 15th 2011 at 05:16 PM.
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  3. #3
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    Re: Volume using mass and density... frustrated

    I am such a fool, thanks. Answers should be in CM^3 and M^3.

    I should be converting CM^3 to M^3 and vice versa.

    I feel like a tool, but thank you!
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  4. #4
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    Re: Volume using mass and density... frustrated

    Quote Originally Posted by polskon View Post
    I feel like a tool, but thank you!
    Don't...now you'll never repeat that slip, right?
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