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Homework Help: Help with a physics/calc problem involving work.

  1. Aug 29, 2007 #1
    In my Calc II class, we are starting to learn applications regarding work. Now I know Work = the integral of (Force) x (Distance) dx, but the question involves a fluid. So the equation is
    W= Integral of F x D dx, but we replace F= (Volume) x (Density). This is were I am confuse. How does (Volume) x (Density)=F?. Doesn't F=(mass) x (acceleration)? I don't see the relation between the F=V(density) and the F=ma.
     
  2. jcsd
  3. Aug 29, 2007 #2
    It doesn't. Must be a mistake. Volume * Density = mass, not force.
     
  4. Aug 30, 2007 #3
    Must be volume*density*acceleration of fluid.
     
  5. Aug 30, 2007 #4
    I too believe this must be the case. In fluid mechanics parameters are frequently described through their volume density.
     
  6. Sep 9, 2007 #5
    I asked my teacher, and because it's a math class, she said that we are to assume that mass and weight are equal.
     
  7. Sep 9, 2007 #6
    what book are you using?

    my Stewart 5th ed they do Work problems involving liquids to be:

    W=F*d=m*a*d=Density*Volume*acceleration*distance
     
  8. Sep 9, 2007 #7
    I'm using a book called Calculus 8th ed. by Larson, Hostetler and Edwards.
     
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