
Concept explainers
(a)
To calculate: the work required to pump the water out of the tank.
(a)

Answer to Problem 29RE
The required work to pump the water out of the tank is
Explanation of Solution
Given information:
The shape of the tank is paraboloid.
Height of the tank is
Radius of the tank is
Weight density of water is
Calculation:
Sketch the parabolic shape tank for dimension as shown below:
Show the equation of parabola as shown below:
The radius of the cross section at y as follows:
Show the area of cross section as shown below:
Expression of volume at an equipotential in the gravitational field:
Express to find the mass as shown below:
Substitute
The distance of the layer each particle approximately
The work done
Expression to find the element of work:
Here, F is the force, and d is the distance.
Substitute
Express to find the total work as shown below:
Substitute 0 for a, 4 for b, and
Therefore, required work to pump the water out of the tank is
(b)
To find: the remaining depth of water in the tank after
(b)

Answer to Problem 29RE
The remaining depth of water in the tank after
Explanation of Solution
Given information:
The work done is
Calculation:
Apply the integral equation to find the remaining depth of water after 4000 ft-lb of work done.
Both sides divided by
Solving the Equation to get d.
The depth value of -1.5 ft is negative.
The depth value of 5.434 ft greater than the given depth value.
Therefore, the remaining depth of water in the tank after
Chapter 6 Solutions
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