Discussion
The upward buoyant force exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the weight of the fluid that the body displaces. This statement is known as:
Answer: D
The statement that the upward buoyant force on a body immersed in a fluid equals the weight of the fluid displaced is Archimedes' principle. Newton's third law is about action and reaction, Bernoulli's principle is about pressure and speed in flow, and Pascal's principle is about transmission of pressure in a confined fluid, so only Archimedes' principle fits the statement.
The same principle gives the condition for floating: a body floats when the weight of fluid it displaces equals its own weight, so the buoyant force balances its weight.
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