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Math Help - Advanced Integration problem

  1. #1
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    Advanced Integration problem

    (a) When standing on one of its circular ends, a typical Bordeaux wine barrel has
    height 94cm. The diameter of the barrel at the widest point is 70cm. When the
    barrel is standing in this way, the curved edge of the vertical cross section (through
    the centre of the barrel) is a parabola whose derviative is 2
    2/275x, where x is the
    vertical distance from the centre of the barrel. Assuming that 1 litre = 1000cm3,
    find the volume of wine that the barrel holds.

    [(b) Evaluate the validity of your answer by calculating the volume of a more funda-
    mental solid of similar dimensions.

    I thought as we are talking about a barrel the volume is in this case Volume(barrel)=h*Pi*(2r1^2 + r2^2) / 3
    Also though as y`= 2/275x then y=x^2/275
    hence the volume of the barrel must be the Pi*Integral of y^2 dx( formula)
    so Pi*integral of (x^2/275)^2 dx must be equal to =h*Pi*(2r1^2 + r2^2) / 3 but that wasnt the case, I couldnt find r2 but I claimed that it was
    r1/2 but in the end I got that(finding volume with integration formula) Pi*(x^5/378125)+C= 271350,975(finding volume barrel formula) I AM NOT SURE WHAT TO DO NEXT...=(
    Last edited by aa751; November 3rd 2010 at 10:00 AM.
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  2. #2
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    I am super confused lol--.--
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