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Homework Help: Find the cross-sectional area of a gutter

  1. Jun 23, 2008 #1
    "A rain gutter is to be constructed from a metal sheet of width 30 cm by bending up one-third of the sheet on each side through an angle (theta)

    Show that the cross-sectional area of the gutter is modeled by the function A(theta)=100sin(theta)+100sin(theta)cos(theta)"

    My Question:

    what is meant by cross-sectional?
     
  2. jcsd
  3. Jun 23, 2008 #2

    mgb_phys

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    It's simply the area if cut across it.
    So if you bent up the two sides by 90deg it would be a a square 10cm wide by 10cm high = csa of 100cm^2
     
  4. Jun 23, 2008 #3
    what does "csa" mean?
     
  5. Jun 23, 2008 #4

    mgb_phys

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    Cross Sectional Area
     
  6. Jun 23, 2008 #5
    ...Are the cross-sections where I bend the metal frame, so that each of my cross-sections will have a width of 10cm.?

    EDIT: nm, your previous post clarified.
     
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