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Math Help - Conversion:

  1. #1
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    Conversion:

    Thanks for the help

    -qbkr21

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    Quote Originally Posted by qbkr21 View Post
    Thanks for the help

    -qbkr21

    No.

    you have to convert inches to centimeters before you carry out your calculations.

    1 inch = 2.54 cm

    so your volume is [4(2.54)]^3

    i don't get what you did for the last part. what formula are you using? should you not use weight = mass*gravity ?
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    Quote Originally Posted by Jhevon View Post
    No.

    you have to convert inches to centimeters before you carry out your calculations.

    1 inch = 2.54 cm

    so your volume is [4(2.54)]^3

    i don't get what you did for the last part. what formula are you using? should you not use weight = mass*gravity ?
    (length)^3 = Volume

    *Is there a rule that I am missing? Must the length always be in cm before it's cubed?

    Thanks,
    qbkr21
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  4. #4
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    Quote Originally Posted by qbkr21 View Post
    (length)^3 = Volume

    *Is there a rule that I am missing? Must the length always be in cm before it's cubed?

    Thanks,
    qbkr21
    That's because the density is given in cm^3, so you have to choose either cm, either inches, but not the 2 at the same time !
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    I converted the inches to cm and found it to equal 10.16

    so...

    (10.16)^3 = 1048.77 (This now my volume?)

    So

    Density = mass/ volume

    (19.3)/ = (x)/(1048.77) = 20241.3 grams

    1 lb. = 453.59 g

    (20241.3 grams)(1 lb. / 453.59 grams) = 44.6247 lbs.

    Correct?
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    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by qbkr21 View Post
    I converted the inches to cm and found it to equal 10.16

    so...

    (10.16)^3 = 1048.77 (This now my volume?)

    So

    Density = mass/ volume

    (19.3)/ = (x)/(1048.77) = 20241.3 grams

    1 lb. = 453.59 g

    (20241.3 grams)(1 lb. / 453.59 grams) = 44.6247 lbs.

    Correct?
    looks good.

    so you didn't use weight = mass*gravity, you used a conversion factor from grams to pounds. ok
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  7. #7
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    Quote Originally Posted by Jhevon View Post
    looks good.

    so you didn't use weight = mass*gravity, you used a conversion factor from grams to pounds. ok
    Suppose I did want to use the formula above weight = mass*gravity...

    Would I not only have to convert the given inches to meters but also the density for gold 19.3 g/cm^3 to just g/m^3?
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    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by qbkr21 View Post
    Suppose I did want to use the formula above weight = mass*gravity...

    Would I not only have to convert the given inches to meters but also the density for gold 19.3 g/cm^3 to just g/m^3?
    yeah...too much work, huh? your way is fine
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