Answer:
The buoyant force is 10 N
Explanation:
We have the information that
The weight of the metal block in air is 40 N
The real weight of the object corresponds to the weight in air
The true weight of the metal block is 40 N
Its apparent weight while submerged in water is
The weight of the block in water amounts to 30 N
The apparent weight of the block is 30 N
Water density is 1000 kg / cubic meter
We are to determine the buoyant force acting on the block due to water.
The buoyant force is established as the difference between the actual weight and the apparent weight
Hence, the buoyant force on the block due to the water is computed as 40 - 30 = 10 N
Thus, the buoyant force acting on the block from the water equals 10 N