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Homework Help: Finding volume by using cross section?

  1. May 26, 2012 #1
    1. The problem statement, all variables and given/known data

    The only given data is that the cross section is 1m^2, the shape is circular (like a cut wire/rod) and i have to find the volume.

    2. Relevant equations

    from what i've searched, i found the equation:
    but i have no idea what to do with it, i still haven't learned it at school.
    if you know any other way to do it, please tell me with explanations. thank you!

    3. The attempt at a solution
  2. jcsd
  3. May 26, 2012 #2
    If you have the cross section of a cylinder, then you can find the radius
    [itex]A=\pi r^2 => r=\sqrt{A/\pi}[/itex]
    From the radius, you could find the volume if you were dealing with a sphere, or if you are dealing with a cylinder, you would need a length/height.
    [itex]V_{cylinder} = \pi r^2 l
    V_{sphere} = 4/3 \pi r^3[/itex]
  4. May 26, 2012 #3
    So my A here is 1m^2?
  5. May 26, 2012 #4
    To find the volume of a rod of uniform crossection area (square, circular, triangular....it does not matter) the equationis L x area
    so if area is 1m^2 and the rod is 1 m long the volume is 1m^3, 10m long it is 10m^3 and so on
  6. May 26, 2012 #5
    edit, misposted
    please delete
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