CHEE 3525 Lecture Notes - Lecture 18: Specific Weight

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Section 4: buoyancy and stability (mott chapter 5) Buoyancy: a body in a fluid, whether floating or submerged, is buoyed up by a force equal to the weight of the fluid displaced. (a) submerged body. The buoyant force, fb, of the fluid = weight of volumedhck if w = (and opposite) fb if w > fb if w < fb . When a body in equilibrium is given a displacement tilt or list , a horizontal distance separates w and fb, which, in combination create moments that tend to rotate the body. If the moment acts to restore the original position stable equilibrium. The criterion for stability for a fully submerged body is that the centre of buoyancy must be above the centre of gravity of the body. Example 1: a block of material having a specific weight of 35 knm-3 is suspended in water by a cable.

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