buoyancy question

Buoyancy - A cork is pushed down into water kept in a glass. We find that as soon as it is released, the cork rises on its own and comes to the surface. Pressure pushes cork upwards To keep it beneath the surface of water, we have to exert downward force. This means that, when the cork is..

A cork is pushed down into water kept in a glass. We find that as soon as it is released, the cork rises on its own and comes to the surfac..

It is a matter of common experience that bodies appear lighter when immersed in water or any other liquid. While bathing we notice that the mug of water suddenly appears heavier as soon as it comes above the water surface. Similarly, when a fish is pulled out of water, it appears to be heavier in a..

The presence of air bladders in many bony fishes act as an accessory respiratory organ as well as an organ for buoyancy. Using these bladders the fishes are able to maintain themselves at desired depths. The body is covered with scales. The presence of a third membrane called the ni..

(a) Center of gravity in loading a ship When a ship floats in the water the forces of buoyancy and gravity balance each other because they are equal. The following three diagrams show how loads affect the center of gravity and stability of a ship. A fully loaded ship [figure (a)] brings ..

Archimedes' Principle - An iron needle sinks in water but a huge ship floats on the surface of water. All objects whether inside the liquid (or fluid) or partially inside, appear to be lighter than in air. This is because liquids (or fluids) exert upward force on the immersed object. This is called..

It includes a much-advanced group of algae , which are mostly marine forms. They are commonly called as 'sea weeds'. The plant body may be filamentous or may show root like hold fast, stemlike stipe and leaf like blades . Many of them have air bladders which keep them afloat by providing buoya..

Oil and oil wastes enter rivers and other water bodies from different sources such as oil refineries, storage tanks, petro-chemical plants, industrial effluents, oil tanker spillage and automobile waste oil. Normal tanker operations and spillage from ocean going oil tankers accidents cause marine ..

Let W = V r g be the true weight of body, acting through the centre of gravity and let 'w' be the weight of the liquid displaced, acting through the centre of gravity of the displaced liquid (called the centre of buoyancy). W-w = observed weight of the body immersed in a liquid (or fluid)..