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September 20, 2014

September 20, 2014

Posted by **sam** on Wednesday, December 29, 2010 at 3:18pm.

a) At what minimum pressure must the water be pumped to arrive at the village? The acceleration of gravity is 9.8m/s^3

b)If 4800m^3 are pumped per day, what is the speed of water in the pipe?

c) What additional pressure is necessary to deliver this flow? You may assume that the free-fall acceleration and the density for air are constant over this range of elevations.

- physics -
**drwls**, Thursday, December 30, 2010 at 11:30ama) (density)*g*(elevation change)

= 1.00*10^3 kg/m^3*9.8 m/s^2*1532 m = 15.0*10^6 Pascals

That is about 150 atmospheres.

b) Velocity = (Volume flow rate)/Area

c) Add (1/2)*(density)*V^2 dynamic pressure to the answer in (a)

The density here is the density of water . Air has a neglible effect on the difference between inlet and outlet pressure

- physics -
**confused**, Thursday, December 30, 2010 at 3:07pmTHANK YOU!!!

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