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December 22, 2014

December 22, 2014

Posted by **Vivi** on Wednesday, February 13, 2013 at 1:54am.

- Calculus -
**Steve**, Wednesday, February 13, 2013 at 1:10pmwhen the water is y ft deep, the radius of the surface is y/3.

v = 1/3 pi r^2 h = 1/2 pi (y/3)^2 * y = pi/18 y^3

so, y = (18v/pi)^(1/3)

dy/dt = 1/3 * (18v/pi)^(-2/3) * 18/pi

= 1/3 * 18/pi * (pi/18*8)^(2/3)

= 4∛(2/(3pi))

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