A bacterium is swimming in a viscous medium. • The bacterium is subject to gravity, a drag force, and a buoyant force • Assume the drag force that proportional to the object's speed, with a constant of propor- tionality a • The bacterium is a uniform sphere of radius r and density po • The surrounding fluid has density pf The bacterium is capable of "swimming" by virtue of creating a constant force F, pointing toward the direction it wants to move in. ) Determine an expression for the bacterium's velocity as a function of time if it is swimming ownwards (i.e., in the same direction as gravity). ) Determine an expression for the bacterium's velocity as a function of time if it is swimming pwards (i.e., directly against gravity). ) Assume the bacterium is naturally buoyant (i.e., po = pf). Compute the ratio of terminal elocities between the swimming upwards and downward conditions
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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