![]() ![]() Since the line of actions of hydrostatic forces applied on the curved surfaces passes through the pivot point, the forces have no effect on the moment. This moment can be counterbalanced by adding weight to the weight hanger, which is located at the left end of the balance arm, at a fixed distance from the pivot. ![]() The knife edges coincide with the center of the arc of the quadrant therefore, the only hydrostatic force acting on the vertical surface of the quadrant creates moment about the pivot point. The quadrant is mounted on a balance arm that pivots on knife edges. The water tank has a drain valve at one end and three adjustable screwed-in feet on its base for leveling the apparatus. ![]() The equipment is comprised of a rectangular transparent water tank, a fabricated quadrant, a balance arm, an adjustable counter-balance weight, and a water-level measuring device (Figure 1.1). You may assume that tank internal pressure is always in equilibrium with the ocean's hydrostatic pressure and that the inlet pipe to the tank is at the bottom of the tank and penetrates the hull at the "depth" of the submarine.\) Consider a ballast tank, which can be modeled as a vertical half-cylinder $(R=8 \mathrm$ is important in maintaining the boat's attitude, determine the weight of water in the tank as a function of depth during the dive. The amount of water admitted is controlled by air pressure, because seawater will cease to flow into the tank when the internal pressure (at the hull penetration) is equal to the hydrostatic pressure at the depth of the submarine. ![]() A submarine submerges by admitting seawater $(S=1.03)$ into its ballast tanks. ![]()
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