[amp_mcq option1=”coincides with the centre of gravity” option2=”coincides with the centroid of the volume of fluid displaced” option3=”remains above the centre of gravity” option4=”remains below the centre of gravity” correct=”option2″]
The correct answer is: B. coincides with the centroid of the volume of fluid displaced.
The center of buoyancy is the point at which the buoyant force acts on an object. It is always located directly below the centroid of the volume of fluid displaced by the object. This is because the buoyant force is equal to the weight of the fluid displaced, and the weight of an object is always concentrated at its center of gravity.
To understand why the center of buoyancy is always located below the centroid of the volume of fluid displaced, consider the following example. Imagine a cube of wood floating in water. The center of gravity of the cube is located at its geometric center, which is also the centroid of the volume of the cube. However, the center of buoyancy is located below the geometric center, because the wood displaces more water at the bottom of the cube than at the top.
The center of buoyancy is an important concept in fluid mechanics, and it is used in many applications, such as the design of ships and submarines.