February 10, 2016

Homework Help: Calculus

Posted by COFFEE on Sunday, June 17, 2007 at 5:47pm.

The hemispherical tank shown is full of water. Given that water weighs 62.5 lb/ft3, find the work required to pump the water out of the tank.
What is shown is just the tank (a hemisphere) with a radius of 5 ft.
First I calculated the Volume of the hemisphere, V = (2/3)*pi*r^3
V = (2/3)*pi*125 = (250/3)*pi
Then I took the integral of: Volume*5y*dy from 0 to 5.
Which equals: ((250/3)*pi)*(5/2)y^2 evaluated at 5 and 0.
I came up with 16362.5 ft*lb.
Am I using the wrong method?

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