P15 072

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72. We rewrite the formula for work W (when the force is constant in a direction parallel to the displacement

d) in terms of pressure:

W = F d =



F

A



(Ad) = pV

where V is the volume of the water being forced through, and p is to be interpreted as the pressure
difference between the two ends of the pipe. Thus,

W =



1.01

× 10

5

Pa

 

1.4 m

3



= 1.5

× 10

5

J .


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