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Homework Help: Volume and density problem

  1. Jan 10, 2004 #1
    Here is the problem:

    An auditorium measures 40.0m X 20.0m X 12.0m. the density of the air is 1.20kg/m^3.

    a) what is the volume in cubic ft?

    b) the weight of the air in the room in pounds.

    for a) i have some big answer. 339020 ft^3. using V=l*w*h and then using basic dimensional analysis to convert from cubic meters to cubic ft. (my answer in metric was 9600m^3.

    for b) i have no clue how to convert a density to a weight.

    any pointers or suggestions would be great.


  2. jcsd
  3. Jan 10, 2004 #2
    Multiply Density with Volume to get the weight in Kg , and do the conversion into pounds.
  4. Jan 10, 2004 #3
    thanks for the help.

    that was a total rookie mistake that i made.

    <------ is done with calculus, but cannot manipulate a simple equation.
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