
To Find: The hydrostatic force on the side of the gate.

Answer to Problem 31RE
The net force is 458 lb .
Explanation of Solution
Given:
The gate in the irrigation canal is constructed in the form of the trapezoid 3 ft wide and the bottom is 5 ft wide at the top and 2 ft high.
Calculation:
The given diagram is shown in Figure 1
Figure 1
Consider the vertical x− axis at the centre of the gate such that the origin is the surface of the water and consider that ABCD be the gate.
Then,
|EF|=|BC|=3 ft
Then,
|AD|=|5 ft|=|EF|+|AE|+|FD|=|EF|+2|AE|=3+2|AE|
Then,
|AE|=1 ft
Consider the distance of the height of strip from the origin is,
x*i
Then, by the triangle property,
a2−x*i=12a=12(2−x*i)
Then, the width of the strip is,
3+2a=3+(2−x*i)=5−x*i
Then, the area of the strip is,
Ao=(5−x*i)Δx
Then, the pressure on the strip is,
P=δdi=62.5x*i
Then, the force on the strip is,
Fi=62.5x*i(5−x*i)Δx
Then, the total force on the side length is,
F=limn→∞n∑i=162.5x*i(5−x*i)Δx=∫2062.5x(5−x)dx=62.5(223) lb=458 lb
Chapter 6 Solutions
Single Variable Calculus: Concepts and Contexts, Enhanced Edition
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