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Math Help - Pumping water out of a cone.

  1. #1
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    Pumping water out of a cone.

    A tank has the shape of an inverted circular cone (point at the bottom) with height 10 feet and radius 4 feet. The tank is full of water. We pump out water (to a pipe at the top of the tank) until the water level is 5 feet from the bottom. The work W required to do this is given by?

    I've tried everything on this problem and have come up with many different answers, though I only have one submission left on my webassign. If anyone could give me any pointers it would be greatly appreciated!
    Last edited by mr fantastic; September 8th 2010 at 07:48 PM. Reason: Deleted unnecessary !'s etc. from title.
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    Quote Originally Posted by strawlion View Post
    A tank has the shape of an inverted circular cone (point at the bottom) with height 10 feet and radius 4 feet. The tank is full of water. We pump out water (to a pipe at the top of the tank) until the water level is 5 feet from the bottom. The work W required to do this is given by?

    I've tried everything on this problem and have come up with many different answers, though I only have one submission left on my webassign. If anyone could give me any pointers it would be greatly appreciated!
    Please read the forum rule/policy regarding questions that count towards the final grade of a student (the sticky is at the top of every subforum).

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