![]() ![]() ![]() 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. The water level is indicated on a scale on the side of the quadrant.A submarine submerges by admitting seawater $(S=1.03)$ into its ballast tanks. Water is added to the tank via a flexible tube and may be drained through a valve in the side of the tank. ![]() An indicator attached to the side of the tank shows when the balance arm is horizontal. Correct alignment is indicated on a circular spirit level mounted on the base of the tank. This assembly is mounted on top of an acrylic tank which may be levelled by adjusting screwed feet. ![]() The balance arm incorporates a hanger for the weights supplied and an adjustable counterbalance. This means that when the quadrant is immersed, the only force that gives rise to a moment about the knife edges is the hydrostatic force acting on the end face of the quadrant. The knife edges coincide with the centre of the arc of the quadrant. The Hydrostatic Pressure accessory has been designed to determine the static thrust exerted by a fluid on a submerged surface and enables comparison of the measured magnitude and position of this force with simple theory.Ī fabricated quadrant is mounted on a balance arm which pivots on knife edges. ![]()
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