Question

A rock is thrown into a swimming pool that is filled with water at a uniform temperature. As the rock moves beneath the pool's surface and sinks to the bottom of the pool, which of the following statements is true?
a. The buoyant force on the rock increases as it sinks.
b. The buoyant force on the rock decreases as it sinks.
c. The buoyant force on the rock is zero 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.

Answer 1

Answer:

d. The buoyant force on the rock is constant as it sinks.

Explanation:

The sinking of an object in water can be explained by the Archimedes Principle.

The Archimedes principle states that the buoyant force on a submerged substance is equal to the water displaced by the submerging object. The buoyant force, however, does not change with depth as the substance sinks.

In the given question, when the rock moves beneath the pool, the buoyant force do not change and remains the same that is the amount of water displaced by rock remains the same.

Thus, Option-D is the correct answer.