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

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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 of
The bacterium is capable of "swimming" by virtue of creating a constant force F, pointing
toward the direction it wants to move in.
A) Determine an expression for the bacterium's velocity as a function of time if it is swimming
downwards (i.e., in the same direction as gravity).
3) Determine an expression for the bacterium's velocity as a function of time if it is swimming
upwards (i.e., directly against gravity).
C) Assume the bacterium is naturally buoyant (i.e., po = pf). Compute the ratio of terminal
velocities between the swimming upwards and downward conditions
Transcribed Image Text: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 of The bacterium is capable of "swimming" by virtue of creating a constant force F, pointing toward the direction it wants to move in. A) Determine an expression for the bacterium's velocity as a function of time if it is swimming downwards (i.e., in the same direction as gravity). 3) Determine an expression for the bacterium's velocity as a function of time if it is swimming upwards (i.e., directly against gravity). C) Assume the bacterium is naturally buoyant (i.e., po = pf). Compute the ratio of terminal velocities between the swimming upwards and downward conditions
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