A rock is thrown into a swimming pool that is filled with water at a uniform temperature.Which of the following statements is true?
A)The buoyant force on the rock is zero as it sinks.
B)The buoyant force on the rock increases as it sinks.
C)The buoyant force on the rock decreases as it sinks.
D)The buoyant force on the rock is constant as it sinks.
E)The buoyant force on the rock as it sinks is nonzero at first but becomes zero once the terminal velocity is reached.

Question

Quizplus · Accepted Answer

The buoyant force on an object submerged in a fluid is determined by the volume of fluid displaced by the object, according to Archimedes' principle. Since the rock's volume and the water's density remain constant as the rock sinks, the buoyant force remains constant.

A Rock Is Thrown into a Swimming Pool That Is