† † margin: y y x - 2 - 1 1 2 - 2 - 1 1 2 50 water line not to scale d ( y ) = 50 - y Figure 6.5.8: Measuring the fluid force on an underwater porthole in Example 6.5.4. The truth is that it is not, hence the survival tips mentioned at the beginning of this section. Find the fluid force on the porthole, assuming that the center of the square is 14 feet below the surface. A porthole on a vertical side of a submarine (submerged in seawater) is 2 square feet. This is counter-intuitive as most assume that the door would be relatively easy to open. Find the fluid force on the circular plate as shown in the figure given a 5 feet and b 2 feet. Most adults would find it very difficult to apply over 500 lb of force to a car door while seated inside, making the door effectively impossible to open. Using the weight-density of water of 62.4 lb/ft 3, we have the total force as We adopt the convention that the top of the door is at the surface of the water, both of which are at y = 0. Its length is 10 / 3 ft and its height is 2.25 ft. SolutionThe car door, as a rectangle, is drawn in Figure 6.5.7.
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