Students should be familiar with using definite integrals as summations.
This video develops the concept of using an integral to calculate the total fluid force on a vertical surface.
Source: self-created video
This video walks through some examples of calculating fluid force.
Source: self-created video
1. For each exercise, a vertical side of a tank is shaped as described. Calculate the fluid force on the side described. Assume the tank is filled to the top with water (62.4 lbs per cubic ft)
a. A rectangle of height 4 ft and width 5 ft (2496 lbs)
b. An isosceles trapezoid with parallel sides of length 3 ft and 4 ft. The parallel sides are horizontal and the shorter side is down. The distance between the parallel sides is 2 ft. (416 lbs)
c. The region bounded by and the x-axis (measurements in ft). (1064.96 lbs)
2.
a. A vertical circular porthole in an observation ship has diameter 1 ft. It is placed so that the center of the of the porthole is 2 ft below the surface of the ocean. Calculate the fluid force on the porthole (seawater: 64.0 lbs per cubic ft). (100.531 lbs)
b. What would be the fluid force on the same window if it was horizontal rather than vertical? (100.531 lbs)
3. One side of a form for poured concrete is the bottom half of the ellipse . Determine the fluid force on the plate when the form is filled, using 140.7 lbs per cubic ft for concrete. (1500.8 lbs)
4. A vertical plate is submerged in water (62.4). The plate is shaped as a square with length side 3 ft. The plate hangs from its corner and that top corner is 2 ft below the surface of the water. What is the fluid force on the plate? (2314.53 lbs)
5. A tanker truck is transporting gasoline (41 lbs per cubic ft) The tank is in the form of right cylinder with the round ends vertical. The radius of the tank is 3 ft and the distance between the bases is 15 ft. What is the fluid force on one end of the tank when it is full? (3477.74 lbs)
Paul’s Online Notes
http://tutorial.math.lamar.edu/Classes/CalcII/HydrostaticPressure.aspx
Wolfram Alpha
Even when I do it in my calculator, the answer after the integrals is incorrect
On the second video with the trapezoid fluid pressure, it all makes sense, however when I do the math for the actual integral, I foiled it and integrated and do not get the same answer. I'm really confused and don't understand how I'm setting it up right but getting it wrong, still. I know it sounds dumb but can you please do the math out for the integrals?
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