Question

18. In a vessel a large block of wood is floating while an iron nail submerged. In this case the statement that true is -
a) the weight of the wooden block is equal to the buoyant force acting on it
b) the weight of the wooden block is less than the buoyant force acting on it
c) the weight of the submerged iron nail is less than the buoyant force acting on it
d) the iron nail submerged because water did not exert any upward force on it​

Answer 1

B => The weight of the wooden block is less than the buoyant force acting on it.

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Answer 2

In this case, the statement that is true is - a) the weight of the wooden block is equal to the buoyant force acting on it.

• The buoyant force is based on Archimedes' principle and it states that the fluid exerts an upward force to the object submerged in it, which is equal to the weight of the displaced fluid.
• If the buoyant force is equal to the weight of the object, then the object will float. And if the buoyant force is less than the weight of the object, the object will sink.
• A block of wood floats in water is given. Hence, it can be said that the weight of the wooden block is equal to the buoyant force acting on it.