A sphere of mass $0.5$ $\text{kg}$ is dropped into a column of oil. At the instant the sphere becomes completely submerged in the oil, the sphere is moving downward at $8$ $\text{m/s}$, the buoyancy force on the sphere is $4.0$ $\text{N}$, and the fluid frictional force is $4.0$ $\text{N}$. Which of the following describes the motion of the sphere at this instant?

Question

A sphere of mass $0.5$ $\text{kg}$ is dropped into a column of oil. At the instant the sphere becomes completely submerged in the oil, the sphere is moving downward at $8$ $\text{m/s}$, the buoyancy force on the sphere is $4.0$ $\text{N}$, and the fluid frictional force is $4.0$ $\text{N}$. Which of the following describes the motion of the sphere at this instant?(a) The sphere’s speed is decreasing while the sphere continues to move downward.
, (b) The sphere is moving downward at a constant speed.
, (c) The sphere’s speed is increasing while the sphere continues to move downward.
, (d) The sphere’s speed is increasing as the sphere begins moving upward.
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Jason · Accepted Answer

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