Question 1065751
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"The volume of the pool is 7200."


7200 OF WHAT ?   of which units ??  DIMENSION ???



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<U>Comment from student</U>: 7200 ft^3, amount of water in it
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<U>My response</U>: OK, very good.


<pre>
1.  Calculate the inflow rate through the pipe of the diameter {{{d[1]}}} = 2 inches.
    For it, first convert the diameter of 2 inches to feet:   {{{2/12}}} = {{{1/6}}} ft.

    Then calculate the inflow rate  V1 = {{{pi*d[1]^2*v[1]}}} = {{{3.14*(1/6)^2*1.5}}} {{{ft^3/s}}} = 0.1308 {{{ft^3/s}}}.


2.  Calculate the outflow rate through the pipe of the diameter {{{d[2]}}} = 3 inches.
    Again, convert the diameter of 3 inches to feet:  {{{3/12}}} = {{{1/4}}} ft.

    Then calculate the outflow rate  V2 = {{{pi*d[2]^2*v[2]}}} = {{{3.14*(1/4)^2*0.25}}} {{{ft^3/s}}} = 0.049 {{{ft^3/s}}}.


3. Next, calculate net flow as the difference V1 - v2 = 0.1308 - 0.049 = 0.0818 {{{ft^3/s}}}.


4.  As the last step, calculate the time = {{{7200/0.0818}}} = 88051 seconds = 24.46 hours = 24 hours and 30 minutes approximately.
</pre>

Which of these steps was so difficult to you that you could not make it on your own ?