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Unit Conversion-Paint Problem

  1. Oct 25, 2012 #1
    1. The problem statement, all variables and given/known data

    paint.png

    2. Relevant equations

    1 Liter is 1000cm^3
    1 foot is .3048m
    centi is 10^-2

    3. The attempt at a solution
    convert ft to m
    400ft * .3048m/1ft = 121.92m
    convert m to cm
    121.92m is 12192 cm
    12192 cm is 12.192 Liter
    1 gal = 3.78541 L

    I look at the appendix but there is no equation for f^2 or m^2/L. Need help. =]
     
    Last edited: Oct 25, 2012
  2. jcsd
  3. Oct 25, 2012 #2
    You have units of ft^2/gallon and you need to convert to m^2/L.

    You have already done the ft to m conversion, now you need to do gallons to litres.
     
  4. Oct 25, 2012 #3
    There's got to be a way in a physics problem. Here's a picture of the problem. =]
     
  5. Oct 25, 2012 #4
    Sorry, I think I ninja-edited while you were quoting (perhaps). Read it now and it should be fine.
     
  6. Oct 25, 2012 #5
    400ft^2/1 gal * .3048m/1ft = 121.92m^2/1 gal

    121.92m^2/gal * 1 gal/3.78541 Liter = 121.92m^2/3.78541 Liter. Now divide 121.92/3.78541 Liter to turn it into 1 liters and you get 32.2 m^2/ 1 Liter.
     
  7. Oct 25, 2012 #6
    Not quite, remember it's ft^2 and m^2 so you have to do that conversion twice.
     
  8. Oct 25, 2012 #7
    oh boy. let's see. i think I found the problem. heres the fixed conversion!

    400ft^2/ 1 gal * .3048m/1ft = 400 ft/1gal * .3048 m * .3048m/1ft * 1 gal/3.7854L = (400)(.3048m)(.3048m)/(3.7854L) = 37.161216m^2/3.78541 L. To make it one liter it would be 9.8169 m^2/1 L
     
  9. Oct 25, 2012 #8
    Looks good to me. If that isn't working then double-check where you got the gallon-litre conversion; I know that a US gallon is different to a UK gallon and I don't know which countries use MasteringPhysics either!
     
  10. Oct 25, 2012 #9
    whew that was a lot of work! i forgot to round but its 9.82m^2/1 Liter. I got the gallon to liter conversion from google so it could be U.S and i got it correct. Thanks for the guidance! This problem sure stressed me out! =]
     
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