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October 25, 2014

October 25, 2014

Posted by **Anonymous** on Friday, February 22, 2013 at 11:59am.

How much work (in Joules) is required to:

(a) pump all of the water over the side?

(b) pump all of the water out of an outlet 2 m over the side

- calculus -
**Damon**, Friday, February 22, 2013 at 1:08pmIf you are at all smart, none.

You siphon the water out.

However if you really want to lift it all to the top then the answer is the mass of water times height you lift it times gravity ( m g h )

Mass = m = pi (7)^2 (3.5)(1000) m^3

g = 9.8 m/s^2

h = 4 - (3.5)/2 = 2.25 m

so multiply and get Joules

for the second part use 2.25 + 2 = 4.25 for h

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