Answer:
C) The buoyant force on an object is equal to the weight of the fluid displaced by that object.
Step-by-step explanation:
The correct statement among the options provided is C) The buoyant force on an object is equal to the weight of the fluid displaced by that object.
This statement reflects Archimedes' principle, which states that the buoyant force experienced by an object submerged in a fluid is equal to the weight of the fluid displaced by that object. This principle helps explain why objects float or sink in fluids, as the buoyant force counteracts the weight of the object.
The other options are incorrect or unrelated to the principles of fluid mechanics:
A) When a cylindrical object is submerged in a fluid, it is not the difference in pressure between its top and bottom surfaces that is responsible for the buoyant force. Rather, it is the pressure exerted by the fluid on all surfaces of the object.
B) If an external pressure is applied to a confined fluid, the pressure at every point in the fluid does not necessarily increase by the same amount. The increase in pressure depends on the specific conditions and constraints of the system.
D) Any material with a density less than water will not necessarily float in water, as the shape and size of the object also play a significant role in determining its buoyancy.
E) The statement about communism is unrelated to the topic of fluid mechanics and is a subjective opinion rather than an objective fact.