A cylindrical cork (area A, length L, density pc) is floating in a liquid of density Pw with only a part of its length L submerged in the liquid. If the cork is pushed down by a small distance x, and then let go, the cork starts bobbing up and down in a simple harmonic motion. We wish to find the frequency f at which the cork is moving up and down. Let d be the depth of the cork at a certain time t (see figure) and let do be the depth when the cork is in equilibrium (i.e. not bobbing). L d (a) Draw a free body diagram of the cork when it's momentarily at a depth of d < do. Define "up" as the positive direction.
Fluid Pressure
The term fluid pressure is coined as, the measurement of the force per unit area of a given surface of a closed container. It is a branch of physics that helps to study the properties of fluid under various conditions of force.
Gauge Pressure
Pressure is the physical force acting per unit area on a body; the applied force is perpendicular to the surface of the object per unit area. The air around us at sea level exerts a pressure (atmospheric pressure) of about 14.7 psi but this doesn’t seem to bother anyone as the bodily fluids are constantly pushing outwards with the same force but if one swims down into the ocean a few feet below the surface one can notice the difference, there is increased pressure on the eardrum, this is due to an increase in hydrostatic pressure.
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